Finding the Fourth Proportional to 1,560.94, 2,340.72 and 830.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.94 : 2,340.72 = 830.38 : x
2. Step 2: Convert to fraction form
   1,560.94/2,340.72 = 830.38/x
3. Step 3: Cross multiply
   1,560.94x = 2,340.72 × 830.38
4. Step 4: Simplify right side
   1,560.94x = 1,943,687.07
5. Step 5: Solve for x
   x = 1,943,687.07/1,560.94
6. Step 6: Final answer
   x = 1,245.20