Finding the Fourth Proportional to 12,864.90, 17,753.48 and 7,485.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,864.90 : 17,753.48 = 7,485.42 : x
2. Step 2: Convert to fraction form
   12,864.90/17,753.48 = 7,485.42/x
3. Step 3: Cross multiply
   12,864.90x = 17,753.48 × 7,485.42
4. Step 4: Simplify right side
   12,864.90x = 132,892,254.26
5. Step 5: Solve for x
   x = 132,892,254.26/12,864.90
6. Step 6: Final answer
   x = 10,329.83