Finding the Fourth Proportional to 20,832.30, 31,251.69 and 6,978.06

Step by Step Solution

1. Step 1: Write the proportion equation
   20,832.30 : 31,251.69 = 6,978.06 : x
2. Step 2: Convert to fraction form
   20,832.30/31,251.69 = 6,978.06/x
3. Step 3: Cross multiply
   20,832.30x = 31,251.69 × 6,978.06
4. Step 4: Simplify right side
   20,832.30x = 218,076,167.92
5. Step 5: Solve for x
   x = 218,076,167.92/20,832.30
6. Step 6: Final answer
   x = 10,468.18