Finding the Fourth Proportional to 101,016.72, 139,400.88 and 58,579.20

Step by Step Solution

1. Step 1: Write the proportion equation
   101,016.72 : 139,400.88 = 58,579.20 : x
2. Step 2: Convert to fraction form
   101,016.72/139,400.88 = 58,579.20/x
3. Step 3: Cross multiply
   101,016.72x = 139,400.88 × 58,579.20
4. Step 4: Simplify right side
   101,016.72x = 8,165,992,029.70
5. Step 5: Solve for x
   x = 8,165,992,029.70/101,016.72
6. Step 6: Final answer
   x = 80,838.02