Finding the Fourth Proportional to 2,140.53, 3,211.76 and 908.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.53 : 3,211.76 = 908.79 : x
2. Step 2: Convert to fraction form
   2,140.53/3,211.76 = 908.79/x
3. Step 3: Cross multiply
   2,140.53x = 3,211.76 × 908.79
4. Step 4: Simplify right side
   2,140.53x = 2,918,810.83
5. Step 5: Solve for x
   x = 2,918,810.83/2,140.53
6. Step 6: Final answer
   x = 1,363.59