Finding the Fourth Proportional to 1,016.31, 1,522.56 and 620.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.31 : 1,522.56 = 620.10 : x
2. Step 2: Convert to fraction form
   1,016.31/1,522.56 = 620.10/x
3. Step 3: Cross multiply
   1,016.31x = 1,522.56 × 620.10
4. Step 4: Simplify right side
   1,016.31x = 944,139.46
5. Step 5: Solve for x
   x = 944,139.46/1,016.31
6. Step 6: Final answer
   x = 928.99