Finding the Fourth Proportional to 12,180.28, 18,272.33 and 5,160.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,180.28 : 18,272.33 = 5,160.31 : x
2. Step 2: Convert to fraction form
   12,180.28/18,272.33 = 5,160.31/x
3. Step 3: Cross multiply
   12,180.28x = 18,272.33 × 5,160.31
4. Step 4: Simplify right side
   12,180.28x = 94,290,861.42
5. Step 5: Solve for x
   x = 94,290,861.42/12,180.28
6. Step 6: Final answer
   x = 7,741.27