Finding the Fourth Proportional to 108,082.67, 149,111.21 and 72,215.87

Step by Step Solution

1. Step 1: Write the proportion equation
   108,082.67 : 149,111.21 = 72,215.87 : x
2. Step 2: Convert to fraction form
   108,082.67/149,111.21 = 72,215.87/x
3. Step 3: Cross multiply
   108,082.67x = 149,111.21 × 72,215.87
4. Step 4: Simplify right side
   108,082.67x = 10,768,195,191.89
5. Step 5: Solve for x
   x = 10,768,195,191.89/108,082.67
6. Step 6: Final answer
   x = 99,629.25