Finding the Fourth Proportional to 8,752.78, 13,128.15 and 2,178.46

Step by Step Solution

1. Step 1: Write the proportion equation
   8,752.78 : 13,128.15 = 2,178.46 : x
2. Step 2: Convert to fraction form
   8,752.78/13,128.15 = 2,178.46/x
3. Step 3: Cross multiply
   8,752.78x = 13,128.15 × 2,178.46
4. Step 4: Simplify right side
   8,752.78x = 28,599,112.72
5. Step 5: Solve for x
   x = 28,599,112.72/8,752.78
6. Step 6: Final answer
   x = 3,267.43