Finding the Fourth Proportional to 99,490.10, 137,289.40 and 56,470.47

Step by Step Solution

1. Step 1: Write the proportion equation
   99,490.10 : 137,289.40 = 56,470.47 : x
2. Step 2: Convert to fraction form
   99,490.10/137,289.40 = 56,470.47/x
3. Step 3: Cross multiply
   99,490.10x = 137,289.40 × 56,470.47
4. Step 4: Simplify right side
   99,490.10x = 7,752,796,499.77
5. Step 5: Solve for x
   x = 7,752,796,499.77/99,490.10
6. Step 6: Final answer
   x = 77,925.31