Finding the Fourth Proportional to 5,783.90, 7,981.69 and 3,131.29

Step by Step Solution

1. Step 1: Write the proportion equation
   5,783.90 : 7,981.69 = 3,131.29 : x
2. Step 2: Convert to fraction form
   5,783.90/7,981.69 = 3,131.29/x
3. Step 3: Cross multiply
   5,783.90x = 7,981.69 × 3,131.29
4. Step 4: Simplify right side
   5,783.90x = 24,992,930.52
5. Step 5: Solve for x
   x = 24,992,930.52/5,783.90
6. Step 6: Final answer
   x = 4,321.12