Finding the Fourth Proportional to 5,370.71, 7,409.91 and 3,131.00

Step by Step Solution

1. Step 1: Write the proportion equation
   5,370.71 : 7,409.91 = 3,131.00 : x
2. Step 2: Convert to fraction form
   5,370.71/7,409.91 = 3,131.00/x
3. Step 3: Cross multiply
   5,370.71x = 7,409.91 × 3,131.00
4. Step 4: Simplify right side
   5,370.71x = 23,200,408.25
5. Step 5: Solve for x
   x = 23,200,408.25/5,370.71
6. Step 6: Final answer
   x = 4,319.81