Finding the Fourth Proportional to 80,531.61, 120,797.25 and 20,560.05

Step by Step Solution

1. Step 1: Write the proportion equation
   80,531.61 : 120,797.25 = 20,560.05 : x
2. Step 2: Convert to fraction form
   80,531.61/120,797.25 = 20,560.05/x
3. Step 3: Cross multiply
   80,531.61x = 120,797.25 × 20,560.05
4. Step 4: Simplify right side
   80,531.61x = 2,483,597,499.86
5. Step 5: Solve for x
   x = 2,483,597,499.86/80,531.61
6. Step 6: Final answer
   x = 30,840.03