Finding the Fourth Proportional to 1,560.30, 2,153.10 and 930.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.30 : 2,153.10 = 930.78 : x
2. Step 2: Convert to fraction form
   1,560.30/2,153.10 = 930.78/x
3. Step 3: Cross multiply
   1,560.30x = 2,153.10 × 930.78
4. Step 4: Simplify right side
   1,560.30x = 2,004,062.42
5. Step 5: Solve for x
   x = 2,004,062.42/1,560.30
6. Step 6: Final answer
   x = 1,284.41