Finding the Fourth Proportional to 1,616.32, 2,230.72 and 917.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,616.32 : 2,230.72 = 917.76 : x
2. Step 2: Convert to fraction form
   1,616.32/2,230.72 = 917.76/x
3. Step 3: Cross multiply
   1,616.32x = 2,230.72 × 917.76
4. Step 4: Simplify right side
   1,616.32x = 2,047,265.59
5. Step 5: Solve for x
   x = 2,047,265.59/1,616.32
6. Step 6: Final answer
   x = 1,266.62