Finding the Fourth Proportional to 108,661.56, 149,867.82 and 72,840.12

Step by Step Solution

1. Step 1: Write the proportion equation
   108,661.56 : 149,867.82 = 72,840.12 : x
2. Step 2: Convert to fraction form
   108,661.56/149,867.82 = 72,840.12/x
3. Step 3: Cross multiply
   108,661.56x = 149,867.82 × 72,840.12
4. Step 4: Simplify right side
   108,661.56x = 10,916,389,992.94
5. Step 5: Solve for x
   x = 10,916,389,992.94/108,661.56
6. Step 6: Final answer
   x = 100,462.30