Finding the Fourth Proportional to 2,114.77, 2,919.10 and 1,231.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,114.77 : 2,919.10 = 1,231.31 : x
2. Step 2: Convert to fraction form
   2,114.77/2,919.10 = 1,231.31/x
3. Step 3: Cross multiply
   2,114.77x = 2,919.10 × 1,231.31
4. Step 4: Simplify right side
   2,114.77x = 3,594,317.02
5. Step 5: Solve for x
   x = 3,594,317.02/2,114.77
6. Step 6: Final answer
   x = 1,699.63