Finding the Fourth Proportional to 2,283.72, 3,151.17 and 1,288.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,283.72 : 3,151.17 = 1,288.98 : x
2. Step 2: Convert to fraction form
   2,283.72/3,151.17 = 1,288.98/x
3. Step 3: Cross multiply
   2,283.72x = 3,151.17 × 1,288.98
4. Step 4: Simplify right side
   2,283.72x = 4,061,795.11
5. Step 5: Solve for x
   x = 4,061,795.11/2,283.72
6. Step 6: Final answer
   x = 1,778.59