Finding the Fourth Proportional to 1,620.27, 2,428.29 and 742.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.27 : 2,428.29 = 742.46 : x
2. Step 2: Convert to fraction form
   1,620.27/2,428.29 = 742.46/x
3. Step 3: Cross multiply
   1,620.27x = 2,428.29 × 742.46
4. Step 4: Simplify right side
   1,620.27x = 1,802,896.05
5. Step 5: Solve for x
   x = 1,802,896.05/1,620.27
6. Step 6: Final answer
   x = 1,112.71