Finding the Fourth Proportional to 1,118.82, 1,543.83 and 621.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.82 : 1,543.83 = 621.46 : x
2. Step 2: Convert to fraction form
   1,118.82/1,543.83 = 621.46/x
3. Step 3: Cross multiply
   1,118.82x = 1,543.83 × 621.46
4. Step 4: Simplify right side
   1,118.82x = 959,428.59
5. Step 5: Solve for x
   x = 959,428.59/1,118.82
6. Step 6: Final answer
   x = 857.54