Finding the Fourth Proportional to 99,896.68, 149,896.86 and 72,421.48

Step by Step Solution

1. Step 1: Write the proportion equation
   99,896.68 : 149,896.86 = 72,421.48 : x
2. Step 2: Convert to fraction form
   99,896.68/149,896.86 = 72,421.48/x
3. Step 3: Cross multiply
   99,896.68x = 149,896.86 × 72,421.48
4. Step 4: Simplify right side
   99,896.68x = 10,855,752,448.55
5. Step 5: Solve for x
   x = 10,855,752,448.55/99,896.68
6. Step 6: Final answer
   x = 108,669.80