Finding the Fourth Proportional to 1,560.71, 2,341.71 and 1,123.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.71 : 2,341.71 = 1,123.20 : x
2. Step 2: Convert to fraction form
   1,560.71/2,341.71 = 1,123.20/x
3. Step 3: Cross multiply
   1,560.71x = 2,341.71 × 1,123.20
4. Step 4: Simplify right side
   1,560.71x = 2,630,208.67
5. Step 5: Solve for x
   x = 2,630,208.67/1,560.71
6. Step 6: Final answer
   x = 1,685.27