Finding the Fourth Proportional to 158,139.06, 218,233.50 and 86,517.50

Step by Step Solution

1. Step 1: Write the proportion equation
   158,139.06 : 218,233.50 = 86,517.50 : x
2. Step 2: Convert to fraction form
   158,139.06/218,233.50 = 86,517.50/x
3. Step 3: Cross multiply
   158,139.06x = 218,233.50 × 86,517.50
4. Step 4: Simplify right side
   158,139.06x = 18,881,016,836.25
5. Step 5: Solve for x
   x = 18,881,016,836.25/158,139.06
6. Step 6: Final answer
   x = 119,395.02