Finding the Fourth Proportional to 158,089.73, 218,158.31 and 90,128.59

Step by Step Solution

1. Step 1: Write the proportion equation
   158,089.73 : 218,158.31 = 90,128.59 : x
2. Step 2: Convert to fraction form
   158,089.73/218,158.31 = 90,128.59/x
3. Step 3: Cross multiply
   158,089.73x = 218,158.31 × 90,128.59
4. Step 4: Simplify right side
   158,089.73x = 19,662,301,084.50
5. Step 5: Solve for x
   x = 19,662,301,084.50/158,089.73
6. Step 6: Final answer
   x = 124,374.31