Finding the Fourth Proportional to 123,761.42, 170,790.72 and 67,172.79

Step by Step Solution

1. Step 1: Write the proportion equation
   123,761.42 : 170,790.72 = 67,172.79 : x
2. Step 2: Convert to fraction form
   123,761.42/170,790.72 = 67,172.79/x
3. Step 3: Cross multiply
   123,761.42x = 170,790.72 × 67,172.79
4. Step 4: Simplify right side
   123,761.42x = 11,472,489,168.51
5. Step 5: Solve for x
   x = 11,472,489,168.51/123,761.42
6. Step 6: Final answer
   x = 92,698.43