Finding the Fourth Proportional to 101,280.65, 139,738.86 and 58,257.89

Step by Step Solution

1. Step 1: Write the proportion equation
   101,280.65 : 139,738.86 = 58,257.89 : x
2. Step 2: Convert to fraction form
   101,280.65/139,738.86 = 58,257.89/x
3. Step 3: Cross multiply
   101,280.65x = 139,738.86 × 58,257.89
4. Step 4: Simplify right side
   101,280.65x = 8,140,891,134.61
5. Step 5: Solve for x
   x = 8,140,891,134.61/101,280.65
6. Step 6: Final answer
   x = 80,379.53