Finding the Fourth Proportional to 8,784.78, 12,123.28 and 4,805.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,784.78 : 12,123.28 = 4,805.90 : x
2. Step 2: Convert to fraction form
   8,784.78/12,123.28 = 4,805.90/x
3. Step 3: Cross multiply
   8,784.78x = 12,123.28 × 4,805.90
4. Step 4: Simplify right side
   8,784.78x = 58,263,210.74
5. Step 5: Solve for x
   x = 58,263,210.74/8,784.78
6. Step 6: Final answer
   x = 6,632.29