Finding the Fourth Proportional to 99,886.50, 137,843.37 and 55,174.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,886.50 : 137,843.37 = 55,174.50 : x
2. Step 2: Convert to fraction form
   99,886.50/137,843.37 = 55,174.50/x
3. Step 3: Cross multiply
   99,886.50x = 137,843.37 × 55,174.50
4. Step 4: Simplify right side
   99,886.50x = 7,605,439,018.07
5. Step 5: Solve for x
   x = 7,605,439,018.07/99,886.50
6. Step 6: Final answer
   x = 76,140.81