Finding the Fourth Proportional to 123,728.72, 170,746.10 and 67,140.09

Step by Step Solution

1. Step 1: Write the proportion equation
   123,728.72 : 170,746.10 = 67,140.09 : x
2. Step 2: Convert to fraction form
   123,728.72/170,746.10 = 67,140.09/x
3. Step 3: Cross multiply
   123,728.72x = 170,746.10 × 67,140.09
4. Step 4: Simplify right side
   123,728.72x = 11,463,908,185.45
5. Step 5: Solve for x
   x = 11,463,908,185.45/123,728.72
6. Step 6: Final answer
   x = 92,653.58