Finding the Fourth Proportional to 100,865.78, 139,064.69 and 82,648.77

Step by Step Solution

1. Step 1: Write the proportion equation
   100,865.78 : 139,064.69 = 82,648.77 : x
2. Step 2: Convert to fraction form
   100,865.78/139,064.69 = 82,648.77/x
3. Step 3: Cross multiply
   100,865.78x = 139,064.69 × 82,648.77
4. Step 4: Simplify right side
   100,865.78x = 11,493,525,785.55
5. Step 5: Solve for x
   x = 11,493,525,785.55/100,865.78
6. Step 6: Final answer
   x = 113,948.72