Finding the Fourth Proportional to 3,139.80, 4,711.59 and 2,316.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.80 : 4,711.59 = 2,316.30 : x
2. Step 2: Convert to fraction form
   3,139.80/4,711.59 = 2,316.30/x
3. Step 3: Cross multiply
   3,139.80x = 4,711.59 × 2,316.30
4. Step 4: Simplify right side
   3,139.80x = 10,913,455.92
5. Step 5: Solve for x
   x = 10,913,455.92/3,139.80
6. Step 6: Final answer
   x = 3,475.84