Finding the Fourth Proportional to 1,990.34, 2,746.41 and 1,139.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,990.34 : 2,746.41 = 1,139.57 : x
2. Step 2: Convert to fraction form
   1,990.34/2,746.41 = 1,139.57/x
3. Step 3: Cross multiply
   1,990.34x = 2,746.41 × 1,139.57
4. Step 4: Simplify right side
   1,990.34x = 3,129,726.44
5. Step 5: Solve for x
   x = 3,129,726.44/1,990.34
6. Step 6: Final answer
   x = 1,572.46