Finding the Fourth Proportional to 99,490.32, 137,288.52 and 54,778.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,490.32 : 137,288.52 = 54,778.32 : x
2. Step 2: Convert to fraction form
   99,490.32/137,288.52 = 54,778.32/x
3. Step 3: Cross multiply
   99,490.32x = 137,288.52 × 54,778.32
4. Step 4: Simplify right side
   99,490.32x = 7,520,434,480.89
5. Step 5: Solve for x
   x = 7,520,434,480.89/99,490.32
6. Step 6: Final answer
   x = 75,589.61