Finding the Fourth Proportional to 20,308.52, 30,465.34 and 7,828.20

Step by Step Solution

1. Step 1: Write the proportion equation
   20,308.52 : 30,465.34 = 7,828.20 : x
2. Step 2: Convert to fraction form
   20,308.52/30,465.34 = 7,828.20/x
3. Step 3: Cross multiply
   20,308.52x = 30,465.34 × 7,828.20
4. Step 4: Simplify right side
   20,308.52x = 238,488,774.59
5. Step 5: Solve for x
   x = 238,488,774.59/20,308.52
6. Step 6: Final answer
   x = 11,743.29