Finding the Fourth Proportional to 103,718.16, 142,829.91 and 90,100.02

Step by Step Solution

1. Step 1: Write the proportion equation
   103,718.16 : 142,829.91 = 90,100.02 : x
2. Step 2: Convert to fraction form
   103,718.16/142,829.91 = 90,100.02/x
3. Step 3: Cross multiply
   103,718.16x = 142,829.91 × 90,100.02
4. Step 4: Simplify right side
   103,718.16x = 12,868,977,747.60
5. Step 5: Solve for x
   x = 12,868,977,747.60/103,718.16
6. Step 6: Final answer
   x = 124,076.42