Finding the Fourth Proportional to 1,042.03, 1,560.76 and 809.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.03 : 1,560.76 = 809.10 : x
2. Step 2: Convert to fraction form
   1,042.03/1,560.76 = 809.10/x
3. Step 3: Cross multiply
   1,042.03x = 1,560.76 × 809.10
4. Step 4: Simplify right side
   1,042.03x = 1,262,810.92
5. Step 5: Solve for x
   x = 1,262,810.92/1,042.03
6. Step 6: Final answer
   x = 1,211.88