Finding the Fourth Proportional to 1,760.06, 2,428.70 and 1,139.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,760.06 : 2,428.70 = 1,139.06 : x
2. Step 2: Convert to fraction form
   1,760.06/2,428.70 = 1,139.06/x
3. Step 3: Cross multiply
   1,760.06x = 2,428.70 × 1,139.06
4. Step 4: Simplify right side
   1,760.06x = 2,766,435.02
5. Step 5: Solve for x
   x = 2,766,435.02/1,760.06
6. Step 6: Final answer
   x = 1,571.78