Finding the Fourth Proportional to 12,066.62, 18,085.91 and 7,140.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,066.62 : 18,085.91 = 7,140.42 : x
2. Step 2: Convert to fraction form
   12,066.62/18,085.91 = 7,140.42/x
3. Step 3: Cross multiply
   12,066.62x = 18,085.91 × 7,140.42
4. Step 4: Simplify right side
   12,066.62x = 129,140,957.78
5. Step 5: Solve for x
   x = 129,140,957.78/12,066.62
6. Step 6: Final answer
   x = 10,702.34