Finding the Fourth Proportional to 3,913.30, 5,870.52 and 1,139.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.30 : 5,870.52 = 1,139.62 : x
2. Step 2: Convert to fraction form
   3,913.30/5,870.52 = 1,139.62/x
3. Step 3: Cross multiply
   3,913.30x = 5,870.52 × 1,139.62
4. Step 4: Simplify right side
   3,913.30x = 6,690,162.00
5. Step 5: Solve for x
   x = 6,690,162.00/3,913.30
6. Step 6: Final answer
   x = 1,709.60