Finding the Third Proportional to 90,306 and 139,756.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,306 : 139,756.50 = 139,756.50 : x
2. Step 2: Convert to fraction form
   90,306/139,756.50 = 139,756.50/x
3. Step 3: Cross multiply
   90,306x = 139,756.50 × 139,756.50
4. Step 4: Simplify right side
   90,306x = 19,531,879,292.25
5. Step 5: Solve for x
   x = 19,531,879,292.25/90,306
6. Step 6: Final answer
   x = 216,285.51