Finding the Fourth Proportional to 8,791.57, 12,132.71 and 5,015.35

Step by Step Solution

1. Step 1: Write the proportion equation
   8,791.57 : 12,132.71 = 5,015.35 : x
2. Step 2: Convert to fraction form
   8,791.57/12,132.71 = 5,015.35/x
3. Step 3: Cross multiply
   8,791.57x = 12,132.71 × 5,015.35
4. Step 4: Simplify right side
   8,791.57x = 60,849,777.19
5. Step 5: Solve for x
   x = 60,849,777.19/8,791.57
6. Step 6: Final answer
   x = 6,921.38