Finding the Fourth Proportional to 100,981.58, 139,355.55 and 55,661.33

Step by Step Solution

1. Step 1: Write the proportion equation
   100,981.58 : 139,355.55 = 55,661.33 : x
2. Step 2: Convert to fraction form
   100,981.58/139,355.55 = 55,661.33/x
3. Step 3: Cross multiply
   100,981.58x = 139,355.55 × 55,661.33
4. Step 4: Simplify right side
   100,981.58x = 7,756,715,604.27
5. Step 5: Solve for x
   x = 7,756,715,604.27/100,981.58
6. Step 6: Final answer
   x = 76,813.18