Finding the Fourth Proportional to 1,063.56, 1,467.42 and 643.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,063.56 : 1,467.42 = 643.56 : x
2. Step 2: Convert to fraction form
   1,063.56/1,467.42 = 643.56/x
3. Step 3: Cross multiply
   1,063.56x = 1,467.42 × 643.56
4. Step 4: Simplify right side
   1,063.56x = 944,372.82
5. Step 5: Solve for x
   x = 944,372.82/1,063.56
6. Step 6: Final answer
   x = 887.94