Finding the Fourth Proportional to 28,315.55, 42,472.98 and 7,255.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,315.55 : 42,472.98 = 7,255.42 : x
2. Step 2: Convert to fraction form
   28,315.55/42,472.98 = 7,255.42/x
3. Step 3: Cross multiply
   28,315.55x = 42,472.98 × 7,255.42
4. Step 4: Simplify right side
   28,315.55x = 308,159,461.69
5. Step 5: Solve for x
   x = 308,159,461.69/28,315.55
6. Step 6: Final answer
   x = 10,883.05