Finding the Fourth Proportional to 2,116.19, 2,919.39 and 1,231.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.19 : 2,919.39 = 1,231.76 : x
2. Step 2: Convert to fraction form
   2,116.19/2,919.39 = 1,231.76/x
3. Step 3: Cross multiply
   2,116.19x = 2,919.39 × 1,231.76
4. Step 4: Simplify right side
   2,116.19x = 3,595,987.83
5. Step 5: Solve for x
   x = 3,595,987.83/2,116.19
6. Step 6: Final answer
   x = 1,699.27