Finding the Fourth Proportional to 1,118.03, 1,542.89 and 620.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.03 : 1,542.89 = 620.69 : x
2. Step 2: Convert to fraction form
   1,118.03/1,542.89 = 620.69/x
3. Step 3: Cross multiply
   1,118.03x = 1,542.89 × 620.69
4. Step 4: Simplify right side
   1,118.03x = 957,645.58
5. Step 5: Solve for x
   x = 957,645.58/1,118.03
6. Step 6: Final answer
   x = 856.55