Finding the Fourth Proportional to 158,632.12, 218,910.28 and 90,648.31

Step by Step Solution

1. Step 1: Write the proportion equation
   158,632.12 : 218,910.28 = 90,648.31 : x
2. Step 2: Convert to fraction form
   158,632.12/218,910.28 = 90,648.31/x
3. Step 3: Cross multiply
   158,632.12x = 218,910.28 × 90,648.31
4. Step 4: Simplify right side
   158,632.12x = 19,843,846,470.39
5. Step 5: Solve for x
   x = 19,843,846,470.39/158,632.12
6. Step 6: Final answer
   x = 125,093.50