Finding the Fourth Proportional to 99,859.72, 137,807.52 and 54,539.06

Step by Step Solution

1. Step 1: Write the proportion equation
   99,859.72 : 137,807.52 = 54,539.06 : x
2. Step 2: Convert to fraction form
   99,859.72/137,807.52 = 54,539.06/x
3. Step 3: Cross multiply
   99,859.72x = 137,807.52 × 54,539.06
4. Step 4: Simplify right side
   99,859.72x = 7,515,892,601.73
5. Step 5: Solve for x
   x = 7,515,892,601.73/99,859.72
6. Step 6: Final answer
   x = 75,264.51