Finding the Fourth Proportional to 9,792.21, 13,512.89 and 5,315.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,792.21 : 13,512.89 = 5,315.87 : x
2. Step 2: Convert to fraction form
   9,792.21/13,512.89 = 5,315.87/x
3. Step 3: Cross multiply
   9,792.21x = 13,512.89 × 5,315.87
4. Step 4: Simplify right side
   9,792.21x = 71,832,672.42
5. Step 5: Solve for x
   x = 71,832,672.42/9,792.21
6. Step 6: Final answer
   x = 7,335.70