Finding the Fourth Proportional to 1,945.78, 2,685.12 and 1,061.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.78 : 2,685.12 = 1,061.57 : x
2. Step 2: Convert to fraction form
   1,945.78/2,685.12 = 1,061.57/x
3. Step 3: Cross multiply
   1,945.78x = 2,685.12 × 1,061.57
4. Step 4: Simplify right side
   1,945.78x = 2,850,442.84
5. Step 5: Solve for x
   x = 2,850,442.84/1,945.78
6. Step 6: Final answer
   x = 1,464.94