Finding the Fourth Proportional to 1,139.19, 1,570.83 and 740.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.19 : 1,570.83 = 740.34 : x
2. Step 2: Convert to fraction form
   1,139.19/1,570.83 = 740.34/x
3. Step 3: Cross multiply
   1,139.19x = 1,570.83 × 740.34
4. Step 4: Simplify right side
   1,139.19x = 1,162,948.28
5. Step 5: Solve for x
   x = 1,162,948.28/1,139.19
6. Step 6: Final answer
   x = 1,020.86