Finding the Fourth Proportional to 1,063.48, 1,467.38 and 643.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,063.48 : 1,467.38 = 643.72 : x
2. Step 2: Convert to fraction form
   1,063.48/1,467.38 = 643.72/x
3. Step 3: Cross multiply
   1,063.48x = 1,467.38 × 643.72
4. Step 4: Simplify right side
   1,063.48x = 944,581.85
5. Step 5: Solve for x
   x = 944,581.85/1,063.48
6. Step 6: Final answer
   x = 888.20