Finding the Fourth Proportional to 123,231, 170,058.62 and 66,642.38

Step by Step Solution

1. Step 1: Write the proportion equation
   123,231 : 170,058.62 = 66,642.38 : x
2. Step 2: Convert to fraction form
   123,231/170,058.62 = 66,642.38/x
3. Step 3: Cross multiply
   123,231x = 170,058.62 × 66,642.38
4. Step 4: Simplify right side
   123,231x = 11,333,109,992.81
5. Step 5: Solve for x
   x = 11,333,109,992.81/123,231
6. Step 6: Final answer
   x = 91,966.39