Finding the Fourth Proportional to 99,490.72, 137,290.27 and 56,471.09

Step by Step Solution

1. Step 1: Write the proportion equation
   99,490.72 : 137,290.27 = 56,471.09 : x
2. Step 2: Convert to fraction form
   99,490.72/137,290.27 = 56,471.09/x
3. Step 3: Cross multiply
   99,490.72x = 137,290.27 × 56,471.09
4. Step 4: Simplify right side
   99,490.72x = 7,752,931,193.29
5. Step 5: Solve for x
   x = 7,752,931,193.29/99,490.72
6. Step 6: Final answer
   x = 77,926.17