Finding the Fourth Proportional to 2,605.83, 3,908.10 and 1,288.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.83 : 3,908.10 = 1,288.95 : x
2. Step 2: Convert to fraction form
   2,605.83/3,908.10 = 1,288.95/x
3. Step 3: Cross multiply
   2,605.83x = 3,908.10 × 1,288.95
4. Step 4: Simplify right side
   2,605.83x = 5,037,345.50
5. Step 5: Solve for x
   x = 5,037,345.50/2,605.83
6. Step 6: Final answer
   x = 1,933.11