Finding the Fourth Proportional to 12,684.40, 17,500.56 and 7,378.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,684.40 : 17,500.56 = 7,378.24 : x
2. Step 2: Convert to fraction form
   12,684.40/17,500.56 = 7,378.24/x
3. Step 3: Cross multiply
   12,684.40x = 17,500.56 × 7,378.24
4. Step 4: Simplify right side
   12,684.40x = 129,123,331.81
5. Step 5: Solve for x
   x = 129,123,331.81/12,684.40
6. Step 6: Final answer
   x = 10,179.70