Finding the Fourth Proportional to 1,908.38, 2,861.38 and 1,085.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,908.38 : 2,861.38 = 1,085.53 : x
2. Step 2: Convert to fraction form
   1,908.38/2,861.38 = 1,085.53/x
3. Step 3: Cross multiply
   1,908.38x = 2,861.38 × 1,085.53
4. Step 4: Simplify right side
   1,908.38x = 3,106,094.10
5. Step 5: Solve for x
   x = 3,106,094.10/1,908.38
6. Step 6: Final answer
   x = 1,627.61