Finding the Third Proportional to 521,401.50 and 789,457.50

Step by Step Solution

1. Step 1: Write the proportion equation
   521,401.50 : 789,457.50 = 789,457.50 : x
2. Step 2: Convert to fraction form
   521,401.50/789,457.50 = 789,457.50/x
3. Step 3: Cross multiply
   521,401.50x = 789,457.50 × 789,457.50
4. Step 4: Simplify right side
   521,401.50x = 623,243,144,306.25
5. Step 5: Solve for x
   x = 623,243,144,306.25/521,401.50
6. Step 6: Final answer
   x = 1,195,322.88