Finding the Fourth Proportional to 2,185.71, 3,278.51 and 725.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.71 : 3,278.51 = 725.91 : x
2. Step 2: Convert to fraction form
   2,185.71/3,278.51 = 725.91/x
3. Step 3: Cross multiply
   2,185.71x = 3,278.51 × 725.91
4. Step 4: Simplify right side
   2,185.71x = 2,379,899.56
5. Step 5: Solve for x
   x = 2,379,899.56/2,185.71
6. Step 6: Final answer
   x = 1,088.85