Finding the Fourth Proportional to 158,490.72, 218,722.61 and 86,870.72

Step by Step Solution

1. Step 1: Write the proportion equation
   158,490.72 : 218,722.61 = 86,870.72 : x
2. Step 2: Convert to fraction form
   158,490.72/218,722.61 = 86,870.72/x
3. Step 3: Cross multiply
   158,490.72x = 218,722.61 × 86,870.72
4. Step 4: Simplify right side
   158,490.72x = 19,000,591,374.96
5. Step 5: Solve for x
   x = 19,000,591,374.96/158,490.72
6. Step 6: Final answer
   x = 119,884.57