Finding the Fourth Proportional to 8,196.72, 12,300 and 2,931.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,196.72 : 12,300 = 2,931.31 : x
2. Step 2: Convert to fraction form
   8,196.72/12,300 = 2,931.31/x
3. Step 3: Cross multiply
   8,196.72x = 12,300 × 2,931.31
4. Step 4: Simplify right side
   8,196.72x = 36,055,113
5. Step 5: Solve for x
   x = 36,055,113/8,196.72
6. Step 6: Final answer
   x = 4,398.73