Finding the Fourth Proportional to 1,620.49, 2,428.89 and 695.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.49 : 2,428.89 = 695.57 : x
2. Step 2: Convert to fraction form
   1,620.49/2,428.89 = 695.57/x
3. Step 3: Cross multiply
   1,620.49x = 2,428.89 × 695.57
4. Step 4: Simplify right side
   1,620.49x = 1,689,463.02
5. Step 5: Solve for x
   x = 1,689,463.02/1,620.49
6. Step 6: Final answer
   x = 1,042.56