Finding the Third Proportional to 238,972.50 and 521,421.50

Step by Step Solution

1. Step 1: Write the proportion equation
   238,972.50 : 521,421.50 = 521,421.50 : x
2. Step 2: Convert to fraction form
   238,972.50/521,421.50 = 521,421.50/x
3. Step 3: Cross multiply
   238,972.50x = 521,421.50 × 521,421.50
4. Step 4: Simplify right side
   238,972.50x = 271,880,380,662.25
5. Step 5: Solve for x
   x = 271,880,380,662.25/238,972.50
6. Step 6: Final answer
   x = 1,137,705.72