Finding the Fourth Proportional to 8,920.72, 12,308.52 and 5,384.08

Step by Step Solution

1. Step 1: Write the proportion equation
   8,920.72 : 12,308.52 = 5,384.08 : x
2. Step 2: Convert to fraction form
   8,920.72/12,308.52 = 5,384.08/x
3. Step 3: Cross multiply
   8,920.72x = 12,308.52 × 5,384.08
4. Step 4: Simplify right side
   8,920.72x = 66,270,056.36
5. Step 5: Solve for x
   x = 66,270,056.36/8,920.72
6. Step 6: Final answer
   x = 7,428.78