Finding the Fourth Proportional to 103,724.16, 142,838.19 and 90,106.02

Step by Step Solution

1. Step 1: Write the proportion equation
   103,724.16 : 142,838.19 = 90,106.02 : x
2. Step 2: Convert to fraction form
   103,724.16/142,838.19 = 90,106.02/x
3. Step 3: Cross multiply
   103,724.16x = 142,838.19 × 90,106.02
4. Step 4: Simplify right side
   103,724.16x = 12,870,580,804.90
5. Step 5: Solve for x
   x = 12,870,580,804.90/103,724.16
6. Step 6: Final answer
   x = 124,084.70