Finding the Fourth Proportional to 12,645.52, 17,451.56 and 7,338.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,645.52 : 17,451.56 = 7,338.40 : x
2. Step 2: Convert to fraction form
   12,645.52/17,451.56 = 7,338.40/x
3. Step 3: Cross multiply
   12,645.52x = 17,451.56 × 7,338.40
4. Step 4: Simplify right side
   12,645.52x = 128,066,527.90
5. Step 5: Solve for x
   x = 128,066,527.90/12,645.52
6. Step 6: Final answer
   x = 10,127.42