Finding the Fourth Proportional to 1,618.30, 2,425.69 and 693.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.30 : 2,425.69 = 693.10 : x
2. Step 2: Convert to fraction form
   1,618.30/2,425.69 = 693.10/x
3. Step 3: Cross multiply
   1,618.30x = 2,425.69 × 693.10
4. Step 4: Simplify right side
   1,618.30x = 1,681,245.74
5. Step 5: Solve for x
   x = 1,681,245.74/1,618.30
6. Step 6: Final answer
   x = 1,038.90