Finding the Fourth Proportional to 1,690.22, 2,329.61 and 1,216.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,690.22 : 2,329.61 = 1,216.82 : x
2. Step 2: Convert to fraction form
   1,690.22/2,329.61 = 1,216.82/x
3. Step 3: Cross multiply
   1,690.22x = 2,329.61 × 1,216.82
4. Step 4: Simplify right side
   1,690.22x = 2,834,722.62
5. Step 5: Solve for x
   x = 2,834,722.62/1,690.22
6. Step 6: Final answer
   x = 1,677.14