Finding the Third Proportional to 90,135.50 and 141,389.75

Step by Step Solution

1. Step 1: Write the proportion equation
   90,135.50 : 141,389.75 = 141,389.75 : x
2. Step 2: Convert to fraction form
   90,135.50/141,389.75 = 141,389.75/x
3. Step 3: Cross multiply
   90,135.50x = 141,389.75 × 141,389.75
4. Step 4: Simplify right side
   90,135.50x = 19,991,061,405.06
5. Step 5: Solve for x
   x = 19,991,061,405.06/90,135.50
6. Step 6: Final answer
   x = 221,788.99