Finding the Third Proportional to 2,638,206.50 and 5,781,428

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638,206.50 : 5,781,428 = 5,781,428 : x
2. Step 2: Convert to fraction form
   2,638,206.50/5,781,428 = 5,781,428/x
3. Step 3: Cross multiply
   2,638,206.50x = 5,781,428 × 5,781,428
4. Step 4: Simplify right side
   2,638,206.50x = 33,424,909,719,184
5. Step 5: Solve for x
   x = 33,424,909,719,184/2,638,206.50
6. Step 6: Final answer
   x = 12,669,557.79