Finding the Fourth Proportional to 2,076.56, 2,865.96 and 1,290.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,076.56 : 2,865.96 = 1,290.86 : x
2. Step 2: Convert to fraction form
   2,076.56/2,865.96 = 1,290.86/x
3. Step 3: Cross multiply
   2,076.56x = 2,865.96 × 1,290.86
4. Step 4: Simplify right side
   2,076.56x = 3,699,538.80
5. Step 5: Solve for x
   x = 3,699,538.80/2,076.56
6. Step 6: Final answer
   x = 1,781.58