Finding the Fourth Proportional to 1,663.39, 2,493.69 and 690.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.39 : 2,493.69 = 690.18 : x
2. Step 2: Convert to fraction form
   1,663.39/2,493.69 = 690.18/x
3. Step 3: Cross multiply
   1,663.39x = 2,493.69 × 690.18
4. Step 4: Simplify right side
   1,663.39x = 1,721,094.96
5. Step 5: Solve for x
   x = 1,721,094.96/1,663.39
6. Step 6: Final answer
   x = 1,034.69