Finding the Fourth Proportional to 79,109.80, 109,171.10 and 42,811.20

Step by Step Solution

1. Step 1: Write the proportion equation
   79,109.80 : 109,171.10 = 42,811.20 : x
2. Step 2: Convert to fraction form
   79,109.80/109,171.10 = 42,811.20/x
3. Step 3: Cross multiply
   79,109.80x = 109,171.10 × 42,811.20
4. Step 4: Simplify right side
   79,109.80x = 4,673,745,903.35
5. Step 5: Solve for x
   x = 4,673,745,903.35/79,109.80
6. Step 6: Final answer
   x = 59,079.23