Finding the Fourth Proportional to 1,620.01, 2,235.77 and 912.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.01 : 2,235.77 = 912.04 : x
2. Step 2: Convert to fraction form
   1,620.01/2,235.77 = 912.04/x
3. Step 3: Cross multiply
   1,620.01x = 2,235.77 × 912.04
4. Step 4: Simplify right side
   1,620.01x = 2,039,111.67
5. Step 5: Solve for x
   x = 2,039,111.67/1,620.01
6. Step 6: Final answer
   x = 1,258.70