Finding the Fourth Proportional to 99,931.49, 137,913.32 and 56,912.79

Step by Step Solution

1. Step 1: Write the proportion equation
   99,931.49 : 137,913.32 = 56,912.79 : x
2. Step 2: Convert to fraction form
   99,931.49/137,913.32 = 56,912.79/x
3. Step 3: Cross multiply
   99,931.49x = 137,913.32 × 56,912.79
4. Step 4: Simplify right side
   99,931.49x = 7,849,032,158.69
5. Step 5: Solve for x
   x = 7,849,032,158.69/99,931.49
6. Step 6: Final answer
   x = 78,544.13