Finding the Fourth Proportional to 8,384.59, 12,580.53 and 5,791.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,384.59 : 12,580.53 = 5,791.78 : x
2. Step 2: Convert to fraction form
   8,384.59/12,580.53 = 5,791.78/x
3. Step 3: Cross multiply
   8,384.59x = 12,580.53 × 5,791.78
4. Step 4: Simplify right side
   8,384.59x = 72,863,662.04
5. Step 5: Solve for x
   x = 72,863,662.04/8,384.59
6. Step 6: Final answer
   x = 8,690.19