Finding the Fourth Proportional to 144,118.57, 198,886.98 and 90,405.85

Step by Step Solution

1. Step 1: Write the proportion equation
   144,118.57 : 198,886.98 = 90,405.85 : x
2. Step 2: Convert to fraction form
   144,118.57/198,886.98 = 90,405.85/x
3. Step 3: Cross multiply
   144,118.57x = 198,886.98 × 90,405.85
4. Step 4: Simplify right side
   144,118.57x = 17,980,546,480.83
5. Step 5: Solve for x
   x = 17,980,546,480.83/144,118.57
6. Step 6: Final answer
   x = 124,762.18