Finding the Fourth Proportional to 1,118.89, 1,544.04 and 621.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.89 : 1,544.04 = 621.53 : x
2. Step 2: Convert to fraction form
   1,118.89/1,544.04 = 621.53/x
3. Step 3: Cross multiply
   1,118.89x = 1,544.04 × 621.53
4. Step 4: Simplify right side
   1,118.89x = 959,667.18
5. Step 5: Solve for x
   x = 959,667.18/1,118.89
6. Step 6: Final answer
   x = 857.70