Finding the Fourth Proportional to 7,809.72, 10,783.98 and 5,578.44

Step by Step Solution

1. Step 1: Write the proportion equation
   7,809.72 : 10,783.98 = 5,578.44 : x
2. Step 2: Convert to fraction form
   7,809.72/10,783.98 = 5,578.44/x
3. Step 3: Cross multiply
   7,809.72x = 10,783.98 × 5,578.44
4. Step 4: Simplify right side
   7,809.72x = 60,157,785.39
5. Step 5: Solve for x
   x = 60,157,785.39/7,809.72
6. Step 6: Final answer
   x = 7,702.94