Finding the Third Proportional to 309,109.50 and 651,429

Step by Step Solution

1. Step 1: Write the proportion equation
   309,109.50 : 651,429 = 651,429 : x
2. Step 2: Convert to fraction form
   309,109.50/651,429 = 651,429/x
3. Step 3: Cross multiply
   309,109.50x = 651,429 × 651,429
4. Step 4: Simplify right side
   309,109.50x = 424,359,742,041
5. Step 5: Solve for x
   x = 424,359,742,041/309,109.50
6. Step 6: Final answer
   x = 1,372,846.00