Finding the Fourth Proportional to 99,617.91, 137,466.50 and 54,905.91

Step by Step Solution

1. Step 1: Write the proportion equation
   99,617.91 : 137,466.50 = 54,905.91 : x
2. Step 2: Convert to fraction form
   99,617.91/137,466.50 = 54,905.91/x
3. Step 3: Cross multiply
   99,617.91x = 137,466.50 × 54,905.91
4. Step 4: Simplify right side
   99,617.91x = 7,547,723,002.49
5. Step 5: Solve for x
   x = 7,547,723,002.49/99,617.91
6. Step 6: Final answer
   x = 75,766.73