Finding the Fourth Proportional to 2,070.38, 2,857.30 and 1,139.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.38 : 2,857.30 = 1,139.06 : x
2. Step 2: Convert to fraction form
   2,070.38/2,857.30 = 1,139.06/x
3. Step 3: Cross multiply
   2,070.38x = 2,857.30 × 1,139.06
4. Step 4: Simplify right side
   2,070.38x = 3,254,619.00
5. Step 5: Solve for x
   x = 3,254,619.00/2,070.38
6. Step 6: Final answer
   x = 1,571.99