Finding the Fourth Proportional to 1,620.63, 2,236.28 and 922.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.63 : 2,236.28 = 922.05 : x
2. Step 2: Convert to fraction form
   1,620.63/2,236.28 = 922.05/x
3. Step 3: Cross multiply
   1,620.63x = 2,236.28 × 922.05
4. Step 4: Simplify right side
   1,620.63x = 2,061,957.36
5. Step 5: Solve for x
   x = 2,061,957.36/1,620.63
6. Step 6: Final answer
   x = 1,272.32