Finding the Fourth Proportional to 1,063.47, 1,467.72 and 643.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,063.47 : 1,467.72 = 643.84 : x
2. Step 2: Convert to fraction form
   1,063.47/1,467.72 = 643.84/x
3. Step 3: Cross multiply
   1,063.47x = 1,467.72 × 643.84
4. Step 4: Simplify right side
   1,063.47x = 944,973.18
5. Step 5: Solve for x
   x = 944,973.18/1,063.47
6. Step 6: Final answer
   x = 888.58