Finding the Fourth Proportional to 1,757.72, 2,631.78 and 1,139.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,757.72 : 2,631.78 = 1,139.90 : x
2. Step 2: Convert to fraction form
   1,757.72/2,631.78 = 1,139.90/x
3. Step 3: Cross multiply
   1,757.72x = 2,631.78 × 1,139.90
4. Step 4: Simplify right side
   1,757.72x = 2,999,952.86
5. Step 5: Solve for x
   x = 2,999,952.86/1,757.72
6. Step 6: Final answer
   x = 1,706.73