Finding the Fourth Proportional to 8,783.83, 12,122.81 and 5,428.27

Step by Step Solution

1. Step 1: Write the proportion equation
   8,783.83 : 12,122.81 = 5,428.27 : x
2. Step 2: Convert to fraction form
   8,783.83/12,122.81 = 5,428.27/x
3. Step 3: Cross multiply
   8,783.83x = 12,122.81 × 5,428.27
4. Step 4: Simplify right side
   8,783.83x = 65,805,885.84
5. Step 5: Solve for x
   x = 65,805,885.84/8,783.83
6. Step 6: Final answer
   x = 7,491.71