Finding the Fourth Proportional to 1,962.72, 2,945.76 and 1,139.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,962.72 : 2,945.76 = 1,139.85 : x
2. Step 2: Convert to fraction form
   1,962.72/2,945.76 = 1,139.85/x
3. Step 3: Cross multiply
   1,962.72x = 2,945.76 × 1,139.85
4. Step 4: Simplify right side
   1,962.72x = 3,357,724.54
5. Step 5: Solve for x
   x = 3,357,724.54/1,962.72
6. Step 6: Final answer
   x = 1,710.75