Finding the Fourth Proportional to 1,871.74, 2,804.50 and 1,139.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,871.74 : 2,804.50 = 1,139.10 : x
2. Step 2: Convert to fraction form
   1,871.74/2,804.50 = 1,139.10/x
3. Step 3: Cross multiply
   1,871.74x = 2,804.50 × 1,139.10
4. Step 4: Simplify right side
   1,871.74x = 3,194,605.95
5. Step 5: Solve for x
   x = 3,194,605.95/1,871.74
6. Step 6: Final answer
   x = 1,706.76