Finding the Fourth Proportional to 12,421.82, 17,151.89 and 7,953.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,421.82 : 17,151.89 = 7,953.16 : x
2. Step 2: Convert to fraction form
   12,421.82/17,151.89 = 7,953.16/x
3. Step 3: Cross multiply
   12,421.82x = 17,151.89 × 7,953.16
4. Step 4: Simplify right side
   12,421.82x = 136,411,756.78
5. Step 5: Solve for x
   x = 136,411,756.78/12,421.82
6. Step 6: Final answer
   x = 10,981.63