Finding the Fourth Proportional to 1,066.80, 1,472.32 and 647.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.80 : 1,472.32 = 647.31 : x
2. Step 2: Convert to fraction form
   1,066.80/1,472.32 = 647.31/x
3. Step 3: Cross multiply
   1,066.80x = 1,472.32 × 647.31
4. Step 4: Simplify right side
   1,066.80x = 953,047.46
5. Step 5: Solve for x
   x = 953,047.46/1,066.80
6. Step 6: Final answer
   x = 893.37