Finding the Fourth Proportional to 1,066.42, 1,470.07 and 856.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.42 : 1,470.07 = 856.52 : x
2. Step 2: Convert to fraction form
   1,066.42/1,470.07 = 856.52/x
3. Step 3: Cross multiply
   1,066.42x = 1,470.07 × 856.52
4. Step 4: Simplify right side
   1,066.42x = 1,259,144.96
5. Step 5: Solve for x
   x = 1,259,144.96/1,066.42
6. Step 6: Final answer
   x = 1,180.72