Finding the Fourth Proportional to 12,777.90, 17,632.71 and 7,472.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,777.90 : 17,632.71 = 7,472.40 : x
2. Step 2: Convert to fraction form
   12,777.90/17,632.71 = 7,472.40/x
3. Step 3: Cross multiply
   12,777.90x = 17,632.71 × 7,472.40
4. Step 4: Simplify right side
   12,777.90x = 131,758,662.20
5. Step 5: Solve for x
   x = 131,758,662.20/12,777.90
6. Step 6: Final answer
   x = 10,311.45