Finding the Third Proportional to 644,821 and 1,516,715.50

Step by Step Solution

1. Step 1: Write the proportion equation
   644,821 : 1,516,715.50 = 1,516,715.50 : x
2. Step 2: Convert to fraction form
   644,821/1,516,715.50 = 1,516,715.50/x
3. Step 3: Cross multiply
   644,821x = 1,516,715.50 × 1,516,715.50
4. Step 4: Simplify right side
   644,821x = 2,300,425,907,940.25
5. Step 5: Solve for x
   x = 2,300,425,907,940.25/644,821
6. Step 6: Final answer
   x = 3,567,541.86