Finding the Fourth Proportional to 2,111.64, 3,167.36 and 725.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.64 : 3,167.36 = 725.10 : x
2. Step 2: Convert to fraction form
   2,111.64/3,167.36 = 725.10/x
3. Step 3: Cross multiply
   2,111.64x = 3,167.36 × 725.10
4. Step 4: Simplify right side
   2,111.64x = 2,296,649.11
5. Step 5: Solve for x
   x = 2,296,649.11/2,111.64
6. Step 6: Final answer
   x = 1,087.61