Finding the Fourth Proportional to 1,118.02, 1,542.82 and 620.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.02 : 1,542.82 = 620.62 : x
2. Step 2: Convert to fraction form
   1,118.02/1,542.82 = 620.62/x
3. Step 3: Cross multiply
   1,118.02x = 1,542.82 × 620.62
4. Step 4: Simplify right side
   1,118.02x = 957,499.54
5. Step 5: Solve for x
   x = 957,499.54/1,118.02
6. Step 6: Final answer
   x = 856.43