Finding the Fourth Proportional to 158,386.31, 218,588.78 and 90,413.50

Step by Step Solution

1. Step 1: Write the proportion equation
   158,386.31 : 218,588.78 = 90,413.50 : x
2. Step 2: Convert to fraction form
   158,386.31/218,588.78 = 90,413.50/x
3. Step 3: Cross multiply
   158,386.31x = 218,588.78 × 90,413.50
4. Step 4: Simplify right side
   158,386.31x = 19,763,376,340.09
5. Step 5: Solve for x
   x = 19,763,376,340.09/158,386.31
6. Step 6: Final answer
   x = 124,779.58