Finding the Fourth Proportional to 99,688.83, 137,568.56 and 54,976.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99,688.83 : 137,568.56 = 54,976.83 : x
2. Step 2: Convert to fraction form
   99,688.83/137,568.56 = 54,976.83/x
3. Step 3: Cross multiply
   99,688.83x = 137,568.56 × 54,976.83
4. Step 4: Simplify right side
   99,688.83x = 7,563,083,061.58
5. Step 5: Solve for x
   x = 7,563,083,061.58/99,688.83
6. Step 6: Final answer
   x = 75,866.91