Finding the Fourth Proportional to 101,280.15, 139,738.17 and 58,257.39

Step by Step Solution

1. Step 1: Write the proportion equation
   101,280.15 : 139,738.17 = 58,257.39 : x
2. Step 2: Convert to fraction form
   101,280.15/139,738.17 = 58,257.39/x
3. Step 3: Cross multiply
   101,280.15x = 139,738.17 × 58,257.39
4. Step 4: Simplify right side
   101,280.15x = 8,140,781,067.58
5. Step 5: Solve for x
   x = 8,140,781,067.58/101,280.15
6. Step 6: Final answer
   x = 80,378.84