Finding the Fourth Proportional to 12,558.72, 17,331.57 and 7,521.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,558.72 : 17,331.57 = 7,521.98 : x
2. Step 2: Convert to fraction form
   12,558.72/17,331.57 = 7,521.98/x
3. Step 3: Cross multiply
   12,558.72x = 17,331.57 × 7,521.98
4. Step 4: Simplify right side
   12,558.72x = 130,367,766.24
5. Step 5: Solve for x
   x = 130,367,766.24/12,558.72
6. Step 6: Final answer
   x = 10,380.66