Finding the Fourth Proportional to 158,431.89, 218,635.98 and 86,814.72

Step by Step Solution

1. Step 1: Write the proportion equation
   158,431.89 : 218,635.98 = 86,814.72 : x
2. Step 2: Convert to fraction form
   158,431.89/218,635.98 = 86,814.72/x
3. Step 3: Cross multiply
   158,431.89x = 218,635.98 × 86,814.72
4. Step 4: Simplify right side
   158,431.89x = 18,980,821,385.63
5. Step 5: Solve for x
   x = 18,980,821,385.63/158,431.89
6. Step 6: Final answer
   x = 119,804.30