Finding the Fourth Proportional to 9,392.79, 12,963.15 and 5,615.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,392.79 : 12,963.15 = 5,615.91 : x
2. Step 2: Convert to fraction form
   9,392.79/12,963.15 = 5,615.91/x
3. Step 3: Cross multiply
   9,392.79x = 12,963.15 × 5,615.91
4. Step 4: Simplify right side
   9,392.79x = 72,799,883.72
5. Step 5: Solve for x
   x = 72,799,883.72/9,392.79
6. Step 6: Final answer
   x = 7,750.61