Finding the Fourth Proportional to 1,565.33, 2,160.61 and 902.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,565.33 : 2,160.61 = 902.61 : x
2. Step 2: Convert to fraction form
   1,565.33/2,160.61 = 902.61/x
3. Step 3: Cross multiply
   1,565.33x = 2,160.61 × 902.61
4. Step 4: Simplify right side
   1,565.33x = 1,950,185.94
5. Step 5: Solve for x
   x = 1,950,185.94/1,565.33
6. Step 6: Final answer
   x = 1,245.87