Finding the Fourth Proportional to 5,783.74, 7,981.55 and 3,131.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,783.74 : 7,981.55 = 3,131.15 : x
2. Step 2: Convert to fraction form
   5,783.74/7,981.55 = 3,131.15/x
3. Step 3: Cross multiply
   5,783.74x = 7,981.55 × 3,131.15
4. Step 4: Simplify right side
   5,783.74x = 24,991,386.46
5. Step 5: Solve for x
   x = 24,991,386.46/5,783.74
6. Step 6: Final answer
   x = 4,320.98