Finding the Fourth Proportional to 1,062.72, 1,466.60 and 620.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,062.72 : 1,466.60 = 620.55 : x
2. Step 2: Convert to fraction form
   1,062.72/1,466.60 = 620.55/x
3. Step 3: Cross multiply
   1,062.72x = 1,466.60 × 620.55
4. Step 4: Simplify right side
   1,062.72x = 910,095.53
5. Step 5: Solve for x
   x = 910,095.53/1,062.72
6. Step 6: Final answer
   x = 856.38