Finding the Fourth Proportional to 12,870.57, 17,760.15 and 7,204.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.57 : 17,760.15 = 7,204.87 : x
2. Step 2: Convert to fraction form
   12,870.57/17,760.15 = 7,204.87/x
3. Step 3: Cross multiply
   12,870.57x = 17,760.15 × 7,204.87
4. Step 4: Simplify right side
   12,870.57x = 127,959,633.95
5. Step 5: Solve for x
   x = 127,959,633.95/12,870.57
6. Step 6: Final answer
   x = 9,942.03