Finding the Fourth Proportional to 99,345.80, 137,100.81 and 56,912.53

Step by Step Solution

1. Step 1: Write the proportion equation
   99,345.80 : 137,100.81 = 56,912.53 : x
2. Step 2: Convert to fraction form
   99,345.80/137,100.81 = 56,912.53/x
3. Step 3: Cross multiply
   99,345.80x = 137,100.81 × 56,912.53
4. Step 4: Simplify right side
   99,345.80x = 7,802,754,304.49
5. Step 5: Solve for x
   x = 7,802,754,304.49/99,345.80
6. Step 6: Final answer
   x = 78,541.36