Finding the Fourth Proportional to 12,778.42, 17,634.88 and 7,113.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,778.42 : 17,634.88 = 7,113.18 : x
2. Step 2: Convert to fraction form
   12,778.42/17,634.88 = 7,113.18/x
3. Step 3: Cross multiply
   12,778.42x = 17,634.88 × 7,113.18
4. Step 4: Simplify right side
   12,778.42x = 125,440,075.72
5. Step 5: Solve for x
   x = 125,440,075.72/12,778.42
6. Step 6: Final answer
   x = 9,816.56