Finding the Fourth Proportional to 1,069.05, 1,475.31 and 806.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.05 : 1,475.31 = 806.61 : x
2. Step 2: Convert to fraction form
   1,069.05/1,475.31 = 806.61/x
3. Step 3: Cross multiply
   1,069.05x = 1,475.31 × 806.61
4. Step 4: Simplify right side
   1,069.05x = 1,189,999.80
5. Step 5: Solve for x
   x = 1,189,999.80/1,069.05
6. Step 6: Final answer
   x = 1,113.14