Finding the Fourth Proportional to 2,122.98, 3,171.50 and 1,690.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,122.98 : 3,171.50 = 1,690.62 : x
2. Step 2: Convert to fraction form
   2,122.98/3,171.50 = 1,690.62/x
3. Step 3: Cross multiply
   2,122.98x = 3,171.50 × 1,690.62
4. Step 4: Simplify right side
   2,122.98x = 5,361,792.88
5. Step 5: Solve for x
   x = 5,361,792.88/2,122.98
6. Step 6: Final answer
   x = 2,525.60