Finding the Fourth Proportional to 1,118.63, 1,543.72 and 621.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.63 : 1,543.72 = 621.27 : x
2. Step 2: Convert to fraction form
   1,118.63/1,543.72 = 621.27/x
3. Step 3: Cross multiply
   1,118.63x = 1,543.72 × 621.27
4. Step 4: Simplify right side
   1,118.63x = 959,066.92
5. Step 5: Solve for x
   x = 959,066.92/1,118.63
6. Step 6: Final answer
   x = 857.36