Finding the Third Proportional to 820,428 and 1,772,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   820,428 : 1,772,308.50 = 1,772,308.50 : x
2. Step 2: Convert to fraction form
   820,428/1,772,308.50 = 1,772,308.50/x
3. Step 3: Cross multiply
   820,428x = 1,772,308.50 × 1,772,308.50
4. Step 4: Simplify right side
   820,428x = 3,141,077,419,172.25
5. Step 5: Solve for x
   x = 3,141,077,419,172.25/820,428
6. Step 6: Final answer
   x = 3,828,583.88