Finding the Fourth Proportional to 21,199,309,303.74, 29,256,197,315.31 and 12,166,995,196.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,199,309,303.74 : 29,256,197,315.31 = 12,166,995,196.86 : x
2. Step 2: Convert to fraction form
   21,199,309,303.74/29,256,197,315.31 = 12,166,995,196.86/x
3. Step 3: Cross multiply
   21,199,309,303.74x = 29,256,197,315.31 × 12,166,995,196.86
4. Step 4: Simplify right side
   21,199,309,303.74x = 355,960,012,213,765,210,112
5. Step 5: Solve for x
   x = 355,960,012,213,765,210,112/21,199,309,303.74
6. Step 6: Final answer
   x = 16,791,113,668.55