Finding the Fourth Proportional to 103,747.34, 142,870.02 and 90,129.18

Step by Step Solution

1. Step 1: Write the proportion equation
   103,747.34 : 142,870.02 = 90,129.18 : x
2. Step 2: Convert to fraction form
   103,747.34/142,870.02 = 90,129.18/x
3. Step 3: Cross multiply
   103,747.34x = 142,870.02 × 90,129.18
4. Step 4: Simplify right side
   103,747.34x = 12,876,757,749.18
5. Step 5: Solve for x
   x = 12,876,757,749.18/103,747.34
6. Step 6: Final answer
   x = 124,116.51