Finding the Fourth Proportional to 1,620.94, 2,236.72 and 912.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.94 : 2,236.72 = 912.77 : x
2. Step 2: Convert to fraction form
   1,620.94/2,236.72 = 912.77/x
3. Step 3: Cross multiply
   1,620.94x = 2,236.72 × 912.77
4. Step 4: Simplify right side
   1,620.94x = 2,041,599.73
5. Step 5: Solve for x
   x = 2,041,599.73/1,620.94
6. Step 6: Final answer
   x = 1,259.52