Finding the Fourth Proportional to 99,490.35, 137,289.75 and 56,470.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,490.35 : 137,289.75 = 56,470.72 : x
2. Step 2: Convert to fraction form
   99,490.35/137,289.75 = 56,470.72/x
3. Step 3: Cross multiply
   99,490.35x = 137,289.75 × 56,470.72
4. Step 4: Simplify right side
   99,490.35x = 7,752,850,405.54
5. Step 5: Solve for x
   x = 7,752,850,405.54/99,490.35
6. Step 6: Final answer
   x = 77,925.66