Finding the Fourth Proportional to 1,062.72, 1,466.57 and 643.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,062.72 : 1,466.57 = 643.07 : x
2. Step 2: Convert to fraction form
   1,062.72/1,466.57 = 643.07/x
3. Step 3: Cross multiply
   1,062.72x = 1,466.57 × 643.07
4. Step 4: Simplify right side
   1,062.72x = 943,107.17
5. Step 5: Solve for x
   x = 943,107.17/1,062.72
6. Step 6: Final answer
   x = 887.45