Finding the Fourth Proportional to 2,113.61, 3,170.59 and 726.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.61 : 3,170.59 = 726.38 : x
2. Step 2: Convert to fraction form
   2,113.61/3,170.59 = 726.38/x
3. Step 3: Cross multiply
   2,113.61x = 3,170.59 × 726.38
4. Step 4: Simplify right side
   2,113.61x = 2,303,069.31
5. Step 5: Solve for x
   x = 2,303,069.31/2,113.61
6. Step 6: Final answer
   x = 1,089.64