Finding the Fourth Proportional to 1,063.76, 1,467.72 and 621.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,063.76 : 1,467.72 = 621.38 : x
2. Step 2: Convert to fraction form
   1,063.76/1,467.72 = 621.38/x
3. Step 3: Cross multiply
   1,063.76x = 1,467.72 × 621.38
4. Step 4: Simplify right side
   1,063.76x = 912,011.85
5. Step 5: Solve for x
   x = 912,011.85/1,063.76
6. Step 6: Final answer
   x = 857.35