Finding the Fourth Proportional to 20,891,440.99, 28,810,152.78 and 13,441,499.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,891,440.99 : 28,810,152.78 = 13,441,499.30 : x
2. Step 2: Convert to fraction form
   20,891,440.99/28,810,152.78 = 13,441,499.30/x
3. Step 3: Cross multiply
   20,891,440.99x = 28,810,152.78 × 13,441,499.30
4. Step 4: Simplify right side
   20,891,440.99x = 387,251,648,439,656
5. Step 5: Solve for x
   x = 387,251,648,439,656/20,891,440.99
6. Step 6: Final answer
   x = 18,536,378.06