Finding the Fourth Proportional to 2,109.68, 3,164.90 and 723.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.68 : 3,164.90 = 723.18 : x
2. Step 2: Convert to fraction form
   2,109.68/3,164.90 = 723.18/x
3. Step 3: Cross multiply
   2,109.68x = 3,164.90 × 723.18
4. Step 4: Simplify right side
   2,109.68x = 2,288,792.38
5. Step 5: Solve for x
   x = 2,288,792.38/2,109.68
6. Step 6: Final answer
   x = 1,084.90