Finding the Fourth Proportional to 99,404.80, 137,186.40 and 56,973.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99,404.80 : 137,186.40 = 56,973.76 : x
2. Step 2: Convert to fraction form
   99,404.80/137,186.40 = 56,973.76/x
3. Step 3: Cross multiply
   99,404.80x = 137,186.40 × 56,973.76
4. Step 4: Simplify right side
   99,404.80x = 7,816,025,028.86
5. Step 5: Solve for x
   x = 7,816,025,028.86/99,404.80
6. Step 6: Final answer
   x = 78,628.25