Finding the Fourth Proportional to 2,070.50, 2,857.30 and 1,139

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.50 : 2,857.30 = 1,139 : x
2. Step 2: Convert to fraction form
   2,070.50/2,857.30 = 1,139/x
3. Step 3: Cross multiply
   2,070.50x = 2,857.30 × 1,139
4. Step 4: Simplify right side
   2,070.50x = 3,254,464.70
5. Step 5: Solve for x
   x = 3,254,464.70/2,070.50
6. Step 6: Final answer
   x = 1,571.83