Finding the Fourth Proportional to 12,817.95, 17,687.86 and 7,440.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,817.95 : 17,687.86 = 7,440.55 : x
2. Step 2: Convert to fraction form
   12,817.95/17,687.86 = 7,440.55/x
3. Step 3: Cross multiply
   12,817.95x = 17,687.86 × 7,440.55
4. Step 4: Simplify right side
   12,817.95x = 131,607,308.57
5. Step 5: Solve for x
   x = 131,607,308.57/12,817.95
6. Step 6: Final answer
   x = 10,267.43