Finding the Fourth Proportional to 1,820.88, 2,513.58 and 1,296.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820.88 : 2,513.58 = 1,296.78 : x
2. Step 2: Convert to fraction form
   1,820.88/2,513.58 = 1,296.78/x
3. Step 3: Cross multiply
   1,820.88x = 2,513.58 × 1,296.78
4. Step 4: Simplify right side
   1,820.88x = 3,259,560.27
5. Step 5: Solve for x
   x = 3,259,560.27/1,820.88
6. Step 6: Final answer
   x = 1,790.10