Finding the Fourth Proportional to 102,013.49, 140,630.25 and 71,291.21

Step by Step Solution

1. Step 1: Write the proportion equation
   102,013.49 : 140,630.25 = 71,291.21 : x
2. Step 2: Convert to fraction form
   102,013.49/140,630.25 = 71,291.21/x
3. Step 3: Cross multiply
   102,013.49x = 140,630.25 × 71,291.21
4. Step 4: Simplify right side
   102,013.49x = 10,025,700,249.29
5. Step 5: Solve for x
   x = 10,025,700,249.29/102,013.49
6. Step 6: Final answer
   x = 98,278.18