Finding the Third Proportional to 141,028.50 and 309,961.50

Step by Step Solution

1. Step 1: Write the proportion equation
   141,028.50 : 309,961.50 = 309,961.50 : x
2. Step 2: Convert to fraction form
   141,028.50/309,961.50 = 309,961.50/x
3. Step 3: Cross multiply
   141,028.50x = 309,961.50 × 309,961.50
4. Step 4: Simplify right side
   141,028.50x = 96,076,131,482.25
5. Step 5: Solve for x
   x = 96,076,131,482.25/141,028.50
6. Step 6: Final answer
   x = 681,253.30