Finding the Fourth Proportional to 13,425.10, 18,525.78 and 7,456.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,425.10 : 18,525.78 = 7,456.78 : x
2. Step 2: Convert to fraction form
   13,425.10/18,525.78 = 7,456.78/x
3. Step 3: Cross multiply
   13,425.10x = 18,525.78 × 7,456.78
4. Step 4: Simplify right side
   13,425.10x = 138,142,665.79
5. Step 5: Solve for x
   x = 138,142,665.79/13,425.10
6. Step 6: Final answer
   x = 10,289.88