Finding the Fourth Proportional to 20,308.62, 30,444.42 and 7,820.64

Step by Step Solution

1. Step 1: Write the proportion equation
   20,308.62 : 30,444.42 = 7,820.64 : x
2. Step 2: Convert to fraction form
   20,308.62/30,444.42 = 7,820.64/x
3. Step 3: Cross multiply
   20,308.62x = 30,444.42 × 7,820.64
4. Step 4: Simplify right side
   20,308.62x = 238,094,848.83
5. Step 5: Solve for x
   x = 238,094,848.83/20,308.62
6. Step 6: Final answer
   x = 11,723.83