Finding the Third Proportional to 90,139.50 and 140,123.25

Step by Step Solution

1. Step 1: Write the proportion equation
   90,139.50 : 140,123.25 = 140,123.25 : x
2. Step 2: Convert to fraction form
   90,139.50/140,123.25 = 140,123.25/x
3. Step 3: Cross multiply
   90,139.50x = 140,123.25 × 140,123.25
4. Step 4: Simplify right side
   90,139.50x = 19,634,525,190.56
5. Step 5: Solve for x
   x = 19,634,525,190.56/90,139.50
6. Step 6: Final answer
   x = 217,823.76