Finding the Fourth Proportional to 99,806.28, 137,727.83 and 56,781.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,806.28 : 137,727.83 = 56,781.72 : x
2. Step 2: Convert to fraction form
   99,806.28/137,727.83 = 56,781.72/x
3. Step 3: Cross multiply
   99,806.28x = 137,727.83 × 56,781.72
4. Step 4: Simplify right side
   99,806.28x = 7,820,423,079.27
5. Step 5: Solve for x
   x = 7,820,423,079.27/99,806.28
6. Step 6: Final answer
   x = 78,356.02