Finding the Fourth Proportional to 12,780.69, 17,635.95 and 7,114.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.69 : 17,635.95 = 7,114.56 : x
2. Step 2: Convert to fraction form
   12,780.69/17,635.95 = 7,114.56/x
3. Step 3: Cross multiply
   12,780.69x = 17,635.95 × 7,114.56
4. Step 4: Simplify right side
   12,780.69x = 125,472,024.43
5. Step 5: Solve for x
   x = 125,472,024.43/12,780.69
6. Step 6: Final answer
   x = 9,817.31