Finding the Fourth Proportional to 1,620.27, 2,428.34 and 694.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.27 : 2,428.34 = 694.71 : x
2. Step 2: Convert to fraction form
   1,620.27/2,428.34 = 694.71/x
3. Step 3: Cross multiply
   1,620.27x = 2,428.34 × 694.71
4. Step 4: Simplify right side
   1,620.27x = 1,686,988.61
5. Step 5: Solve for x
   x = 1,686,988.61/1,620.27
6. Step 6: Final answer
   x = 1,041.18