Finding the Fourth Proportional to 20,473.43, 30,697.52 and 7,978.91

Step by Step Solution

1. Step 1: Write the proportion equation
   20,473.43 : 30,697.52 = 7,978.91 : x
2. Step 2: Convert to fraction form
   20,473.43/30,697.52 = 7,978.91/x
3. Step 3: Cross multiply
   20,473.43x = 30,697.52 × 7,978.91
4. Step 4: Simplify right side
   20,473.43x = 244,932,555.92
5. Step 5: Solve for x
   x = 244,932,555.92/20,473.43
6. Step 6: Final answer
   x = 11,963.44