Finding the Fourth Proportional to 12,761.77, 17,612.83 and 7,172.77

Step by Step Solution

1. Step 1: Write the proportion equation
   12,761.77 : 17,612.83 = 7,172.77 : x
2. Step 2: Convert to fraction form
   12,761.77/17,612.83 = 7,172.77/x
3. Step 3: Cross multiply
   12,761.77x = 17,612.83 × 7,172.77
4. Step 4: Simplify right side
   12,761.77x = 126,332,742.78
5. Step 5: Solve for x
   x = 126,332,742.78/12,761.77
6. Step 6: Final answer
   x = 9,899.31