Finding the Fourth Proportional to 1,646.76, 2,468.72 and 721.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,646.76 : 2,468.72 = 721.62 : x
2. Step 2: Convert to fraction form
   1,646.76/2,468.72 = 721.62/x
3. Step 3: Cross multiply
   1,646.76x = 2,468.72 × 721.62
4. Step 4: Simplify right side
   1,646.76x = 1,781,477.73
5. Step 5: Solve for x
   x = 1,781,477.73/1,646.76
6. Step 6: Final answer
   x = 1,081.81