Finding the Fourth Proportional to 2,073.40, 2,861.78 and 1,288.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.40 : 2,861.78 = 1,288.04 : x
2. Step 2: Convert to fraction form
   2,073.40/2,861.78 = 1,288.04/x
3. Step 3: Cross multiply
   2,073.40x = 2,861.78 × 1,288.04
4. Step 4: Simplify right side
   2,073.40x = 3,686,087.11
5. Step 5: Solve for x
   x = 3,686,087.11/2,073.40
6. Step 6: Final answer
   x = 1,777.80