Finding the Fourth Proportional to 12,061.30, 18,053.55 and 8,605.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,061.30 : 18,053.55 = 8,605.30 : x
2. Step 2: Convert to fraction form
   12,061.30/18,053.55 = 8,605.30/x
3. Step 3: Cross multiply
   12,061.30x = 18,053.55 × 8,605.30
4. Step 4: Simplify right side
   12,061.30x = 155,356,213.82
5. Step 5: Solve for x
   x = 155,356,213.82/12,061.30
6. Step 6: Final answer
   x = 12,880.55