Finding the Fourth Proportional to 2,173.63, 3,260.72 and 786.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,173.63 : 3,260.72 = 786.79 : x
2. Step 2: Convert to fraction form
   2,173.63/3,260.72 = 786.79/x
3. Step 3: Cross multiply
   2,173.63x = 3,260.72 × 786.79
4. Step 4: Simplify right side
   2,173.63x = 2,565,501.89
5. Step 5: Solve for x
   x = 2,565,501.89/2,173.63
6. Step 6: Final answer
   x = 1,180.28