Finding the Fourth Proportional to 1,620.78, 2,236.32 and 1,032.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.78 : 2,236.32 = 1,032.18 : x
2. Step 2: Convert to fraction form
   1,620.78/2,236.32 = 1,032.18/x
3. Step 3: Cross multiply
   1,620.78x = 2,236.32 × 1,032.18
4. Step 4: Simplify right side
   1,620.78x = 2,308,284.78
5. Step 5: Solve for x
   x = 2,308,284.78/1,620.78
6. Step 6: Final answer
   x = 1,424.18