Finding the Fourth Proportional to 1,063.47, 1,467.63 and 621.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,063.47 : 1,467.63 = 621.30 : x
2. Step 2: Convert to fraction form
   1,063.47/1,467.63 = 621.30/x
3. Step 3: Cross multiply
   1,063.47x = 1,467.63 × 621.30
4. Step 4: Simplify right side
   1,063.47x = 911,838.52
5. Step 5: Solve for x
   x = 911,838.52/1,063.47
6. Step 6: Final answer
   x = 857.42