Finding the Fourth Proportional to 1,663.42, 2,495.34 and 690.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.42 : 2,495.34 = 690.22 : x
2. Step 2: Convert to fraction form
   1,663.42/2,495.34 = 690.22/x
3. Step 3: Cross multiply
   1,663.42x = 2,495.34 × 690.22
4. Step 4: Simplify right side
   1,663.42x = 1,722,333.57
5. Step 5: Solve for x
   x = 1,722,333.57/1,663.42
6. Step 6: Final answer
   x = 1,035.42