Finding the Fourth Proportional to 12,640.64, 17,447.52 and 7,334.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,640.64 : 17,447.52 = 7,334.40 : x
2. Step 2: Convert to fraction form
   12,640.64/17,447.52 = 7,334.40/x
3. Step 3: Cross multiply
   12,640.64x = 17,447.52 × 7,334.40
4. Step 4: Simplify right side
   12,640.64x = 127,967,090.69
5. Step 5: Solve for x
   x = 127,967,090.69/12,640.64
6. Step 6: Final answer
   x = 10,123.47