Finding the Fourth Proportional to 2,870.04, 4,307.50 and 1,139.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.04 : 4,307.50 = 1,139.88 : x
2. Step 2: Convert to fraction form
   2,870.04/4,307.50 = 1,139.88/x
3. Step 3: Cross multiply
   2,870.04x = 4,307.50 × 1,139.88
4. Step 4: Simplify right side
   2,870.04x = 4,910,033.10
5. Step 5: Solve for x
   x = 4,910,033.10/2,870.04
6. Step 6: Final answer
   x = 1,710.79