Finding the Fourth Proportional to 12,761.85, 17,612.55 and 7,727.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,761.85 : 17,612.55 = 7,727.31 : x
2. Step 2: Convert to fraction form
   12,761.85/17,612.55 = 7,727.31/x
3. Step 3: Cross multiply
   12,761.85x = 17,612.55 × 7,727.31
4. Step 4: Simplify right side
   12,761.85x = 136,097,633.74
5. Step 5: Solve for x
   x = 136,097,633.74/12,761.85
6. Step 6: Final answer
   x = 10,664.41