Finding the Fourth Proportional to 1,621.89, 2,431.58 and 696.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.89 : 2,431.58 = 696.69 : x
2. Step 2: Convert to fraction form
   1,621.89/2,431.58 = 696.69/x
3. Step 3: Cross multiply
   1,621.89x = 2,431.58 × 696.69
4. Step 4: Simplify right side
   1,621.89x = 1,694,053.99
5. Step 5: Solve for x
   x = 1,694,053.99/1,621.89
6. Step 6: Final answer
   x = 1,044.49