Finding the Fourth Proportional to 2,116.66, 2,920.89 and 1,331.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.66 : 2,920.89 = 1,331.14 : x
2. Step 2: Convert to fraction form
   2,116.66/2,920.89 = 1,331.14/x
3. Step 3: Cross multiply
   2,116.66x = 2,920.89 × 1,331.14
4. Step 4: Simplify right side
   2,116.66x = 3,888,113.51
5. Step 5: Solve for x
   x = 3,888,113.51/2,116.66
6. Step 6: Final answer
   x = 1,836.91