Finding the Fourth Proportional to 12,688.01, 17,505.18 and 7,378.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688.01 : 17,505.18 = 7,378.46 : x
2. Step 2: Convert to fraction form
   12,688.01/17,505.18 = 7,378.46/x
3. Step 3: Cross multiply
   12,688.01x = 17,505.18 × 7,378.46
4. Step 4: Simplify right side
   12,688.01x = 129,161,270.42
5. Step 5: Solve for x
   x = 129,161,270.42/12,688.01
6. Step 6: Final answer
   x = 10,179.79