Finding the Fourth Proportional to 99,439.30, 137,225.31 and 54,117.34

Step by Step Solution

1. Step 1: Write the proportion equation
   99,439.30 : 137,225.31 = 54,117.34 : x
2. Step 2: Convert to fraction form
   99,439.30/137,225.31 = 54,117.34/x
3. Step 3: Cross multiply
   99,439.30x = 137,225.31 × 54,117.34
4. Step 4: Simplify right side
   99,439.30x = 7,426,268,757.88
5. Step 5: Solve for x
   x = 7,426,268,757.88/99,439.30
6. Step 6: Final answer
   x = 74,681.43