Finding the Fourth Proportional to 8,780.10, 13,170.82 and 2,936.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780.10 : 13,170.82 = 2,936.72 : x
2. Step 2: Convert to fraction form
   8,780.10/13,170.82 = 2,936.72/x
3. Step 3: Cross multiply
   8,780.10x = 13,170.82 × 2,936.72
4. Step 4: Simplify right side
   8,780.10x = 38,679,010.51
5. Step 5: Solve for x
   x = 38,679,010.51/8,780.10
6. Step 6: Final answer
   x = 4,405.30