Finding the Fourth Proportional to 2,085.30, 2,876.72 and 1,288.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.30 : 2,876.72 = 1,288.33 : x
2. Step 2: Convert to fraction form
   2,085.30/2,876.72 = 1,288.33/x
3. Step 3: Cross multiply
   2,085.30x = 2,876.72 × 1,288.33
4. Step 4: Simplify right side
   2,085.30x = 3,706,165.43
5. Step 5: Solve for x
   x = 3,706,165.43/2,085.30
6. Step 6: Final answer
   x = 1,777.29