Finding the Fourth Proportional to 99,540.50, 137,365.89 and 54,828.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,540.50 : 137,365.89 = 54,828.50 : x
2. Step 2: Convert to fraction form
   99,540.50/137,365.89 = 54,828.50/x
3. Step 3: Cross multiply
   99,540.50x = 137,365.89 × 54,828.50
4. Step 4: Simplify right side
   99,540.50x = 7,531,565,699.87
5. Step 5: Solve for x
   x = 7,531,565,699.87/99,540.50
6. Step 6: Final answer
   x = 75,663.33