Finding the Fourth Proportional to 12,690.42, 17,509.95 and 7,655.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,690.42 : 17,509.95 = 7,655.46 : x
2. Step 2: Convert to fraction form
   12,690.42/17,509.95 = 7,655.46/x
3. Step 3: Cross multiply
   12,690.42x = 17,509.95 × 7,655.46
4. Step 4: Simplify right side
   12,690.42x = 134,046,721.83
5. Step 5: Solve for x
   x = 134,046,721.83/12,690.42
6. Step 6: Final answer
   x = 10,562.83