Finding the Fourth Proportional to 2,073.89, 3,111.32 and 687.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.89 : 3,111.32 = 687.13 : x
2. Step 2: Convert to fraction form
   2,073.89/3,111.32 = 687.13/x
3. Step 3: Cross multiply
   2,073.89x = 3,111.32 × 687.13
4. Step 4: Simplify right side
   2,073.89x = 2,137,875.25
5. Step 5: Solve for x
   x = 2,137,875.25/2,073.89
6. Step 6: Final answer
   x = 1,030.85