Finding the Fourth Proportional to 1,066.42, 1,472.04 and 646.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.42 : 1,472.04 = 646.60 : x
2. Step 2: Convert to fraction form
   1,066.42/1,472.04 = 646.60/x
3. Step 3: Cross multiply
   1,066.42x = 1,472.04 × 646.60
4. Step 4: Simplify right side
   1,066.42x = 951,821.06
5. Step 5: Solve for x
   x = 951,821.06/1,066.42
6. Step 6: Final answer
   x = 892.54