Finding the Fourth Proportional to 8,764.65, 13,146.89 and 2,190.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,764.65 : 13,146.89 = 2,190.78 : x
2. Step 2: Convert to fraction form
   8,764.65/13,146.89 = 2,190.78/x
3. Step 3: Cross multiply
   8,764.65x = 13,146.89 × 2,190.78
4. Step 4: Simplify right side
   8,764.65x = 28,801,932.72
5. Step 5: Solve for x
   x = 28,801,932.72/8,764.65
6. Step 6: Final answer
   x = 3,286.15