Finding the Fourth Proportional to 12,666.40, 17,480.71 and 7,360.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,666.40 : 17,480.71 = 7,360.88 : x
2. Step 2: Convert to fraction form
   12,666.40/17,480.71 = 7,360.88/x
3. Step 3: Cross multiply
   12,666.40x = 17,480.71 × 7,360.88
4. Step 4: Simplify right side
   12,666.40x = 128,673,330.42
5. Step 5: Solve for x
   x = 128,673,330.42/12,666.40
6. Step 6: Final answer
   x = 10,158.63