Finding the Fourth Proportional to 12,870.72, 17,761.52 and 7,205.44

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.72 : 17,761.52 = 7,205.44 : x
2. Step 2: Convert to fraction form
   12,870.72/17,761.52 = 7,205.44/x
3. Step 3: Cross multiply
   12,870.72x = 17,761.52 × 7,205.44
4. Step 4: Simplify right side
   12,870.72x = 127,979,597.85
5. Step 5: Solve for x
   x = 127,979,597.85/12,870.72
6. Step 6: Final answer
   x = 9,943.47