Finding the Fourth Proportional to 20,426.89, 30,642.10 and 5,635.81

Step by Step Solution

1. Step 1: Write the proportion equation
   20,426.89 : 30,642.10 = 5,635.81 : x
2. Step 2: Convert to fraction form
   20,426.89/30,642.10 = 5,635.81/x
3. Step 3: Cross multiply
   20,426.89x = 30,642.10 × 5,635.81
4. Step 4: Simplify right side
   20,426.89x = 172,692,872.21
5. Step 5: Solve for x
   x = 172,692,872.21/20,426.89
6. Step 6: Final answer
   x = 8,454.20