Finding the Fourth Proportional to 1,569.94, 2,166.33 and 931.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,569.94 : 2,166.33 = 931.78 : x
2. Step 2: Convert to fraction form
   1,569.94/2,166.33 = 931.78/x
3. Step 3: Cross multiply
   1,569.94x = 2,166.33 × 931.78
4. Step 4: Simplify right side
   1,569.94x = 2,018,527.48
5. Step 5: Solve for x
   x = 2,018,527.48/1,569.94
6. Step 6: Final answer
   x = 1,285.74