Finding the Fourth Proportional to 1,066.08, 1,470.72 and 716.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.08 : 1,470.72 = 716.64 : x
2. Step 2: Convert to fraction form
   1,066.08/1,470.72 = 716.64/x
3. Step 3: Cross multiply
   1,066.08x = 1,470.72 × 716.64
4. Step 4: Simplify right side
   1,066.08x = 1,053,976.78
5. Step 5: Solve for x
   x = 1,053,976.78/1,066.08
6. Step 6: Final answer
   x = 988.65