Finding the Fourth Proportional to 140,307, 193,687.40 and 89,389.56

Step by Step Solution

1. Step 1: Write the proportion equation
   140,307 : 193,687.40 = 89,389.56 : x
2. Step 2: Convert to fraction form
   140,307/193,687.40 = 89,389.56/x
3. Step 3: Cross multiply
   140,307x = 193,687.40 × 89,389.56
4. Step 4: Simplify right side
   140,307x = 17,313,631,463.54
5. Step 5: Solve for x
   x = 17,313,631,463.54/140,307
6. Step 6: Final answer
   x = 123,398.20