Finding the Fourth Proportional to 158,123.78, 218,215.98 and 86,503.81

Step by Step Solution

1. Step 1: Write the proportion equation
   158,123.78 : 218,215.98 = 86,503.81 : x
2. Step 2: Convert to fraction form
   158,123.78/218,215.98 = 86,503.81/x
3. Step 3: Cross multiply
   158,123.78x = 218,215.98 × 86,503.81
4. Step 4: Simplify right side
   158,123.78x = 18,876,513,672.88
5. Step 5: Solve for x
   x = 18,876,513,672.88/158,123.78
6. Step 6: Final answer
   x = 119,378.08