Finding the Fourth Proportional to 99,788.50, 137,708.31 and 55,076.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,788.50 : 137,708.31 = 55,076.50 : x
2. Step 2: Convert to fraction form
   99,788.50/137,708.31 = 55,076.50/x
3. Step 3: Cross multiply
   99,788.50x = 137,708.31 × 55,076.50
4. Step 4: Simplify right side
   99,788.50x = 7,584,491,735.72
5. Step 5: Solve for x
   x = 7,584,491,735.72/99,788.50
6. Step 6: Final answer
   x = 76,005.67