Finding the Fourth Proportional to 10,686.72, 16,031.58 and 3,291.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,686.72 : 16,031.58 = 3,291.78 : x
2. Step 2: Convert to fraction form
   10,686.72/16,031.58 = 3,291.78/x
3. Step 3: Cross multiply
   10,686.72x = 16,031.58 × 3,291.78
4. Step 4: Simplify right side
   10,686.72x = 52,772,434.41
5. Step 5: Solve for x
   x = 52,772,434.41/10,686.72
6. Step 6: Final answer
   x = 4,938.13