Finding the Fourth Proportional to 12,556.88, 17,327.89 and 7,521.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,556.88 : 17,327.89 = 7,521.31 : x
2. Step 2: Convert to fraction form
   12,556.88/17,327.89 = 7,521.31/x
3. Step 3: Cross multiply
   12,556.88x = 17,327.89 × 7,521.31
4. Step 4: Simplify right side
   12,556.88x = 130,328,432.34
5. Step 5: Solve for x
   x = 130,328,432.34/12,556.88
6. Step 6: Final answer
   x = 10,379.05