Finding the Third Proportional to 90,315 and 139,297.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,315 : 139,297.50 = 139,297.50 : x
2. Step 2: Convert to fraction form
   90,315/139,297.50 = 139,297.50/x
3. Step 3: Cross multiply
   90,315x = 139,297.50 × 139,297.50
4. Step 4: Simplify right side
   90,315x = 19,403,793,506.25
5. Step 5: Solve for x
   x = 19,403,793,506.25/90,315
6. Step 6: Final answer
   x = 214,845.75