Finding the Fourth Proportional to 2,176.64, 3,262.72 and 859.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,176.64 : 3,262.72 = 859.86 : x
2. Step 2: Convert to fraction form
   2,176.64/3,262.72 = 859.86/x
3. Step 3: Cross multiply
   2,176.64x = 3,262.72 × 859.86
4. Step 4: Simplify right side
   2,176.64x = 2,805,461.81
5. Step 5: Solve for x
   x = 2,805,461.81/2,176.64
6. Step 6: Final answer
   x = 1,288.90