Finding the Fourth Proportional to 12,796.61, 17,660.21 and 7,761.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,796.61 : 17,660.21 = 7,761.05 : x
2. Step 2: Convert to fraction form
   12,796.61/17,660.21 = 7,761.05/x
3. Step 3: Cross multiply
   12,796.61x = 17,660.21 × 7,761.05
4. Step 4: Simplify right side
   12,796.61x = 137,061,684.52
5. Step 5: Solve for x
   x = 137,061,684.52/12,796.61
6. Step 6: Final answer
   x = 10,710.78