Finding the Fourth Proportional to 20,870.48, 31,311.20 and 6,079.52

Step by Step Solution

1. Step 1: Write the proportion equation
   20,870.48 : 31,311.20 = 6,079.52 : x
2. Step 2: Convert to fraction form
   20,870.48/31,311.20 = 6,079.52/x
3. Step 3: Cross multiply
   20,870.48x = 31,311.20 × 6,079.52
4. Step 4: Simplify right side
   20,870.48x = 190,357,160.10
5. Step 5: Solve for x
   x = 190,357,160.10/20,870.48
6. Step 6: Final answer
   x = 9,120.88