Finding the Fourth Proportional to 1,620.77, 2,429.89 and 695.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.77 : 2,429.89 = 695.57 : x
2. Step 2: Convert to fraction form
   1,620.77/2,429.89 = 695.57/x
3. Step 3: Cross multiply
   1,620.77x = 2,429.89 × 695.57
4. Step 4: Simplify right side
   1,620.77x = 1,690,144.70
5. Step 5: Solve for x
   x = 1,690,144.70/1,620.77
6. Step 6: Final answer
   x = 1,042.81