Finding the Fourth Proportional to 80,807.61, 121,266.72 and 28,217.10

Step by Step Solution

1. Step 1: Write the proportion equation
   80,807.61 : 121,266.72 = 28,217.10 : x
2. Step 2: Convert to fraction form
   80,807.61/121,266.72 = 28,217.10/x
3. Step 3: Cross multiply
   80,807.61x = 121,266.72 × 28,217.10
4. Step 4: Simplify right side
   80,807.61x = 3,421,795,164.91
5. Step 5: Solve for x
   x = 3,421,795,164.91/80,807.61
6. Step 6: Final answer
   x = 42,344.96