Finding the Third Proportional to 3,937,432 and 8,420,840

Step by Step Solution

1. Step 1: Write the proportion equation
   3,937,432 : 8,420,840 = 8,420,840 : x
2. Step 2: Convert to fraction form
   3,937,432/8,420,840 = 8,420,840/x
3. Step 3: Cross multiply
   3,937,432x = 8,420,840 × 8,420,840
4. Step 4: Simplify right side
   3,937,432x = 70,910,546,305,600
5. Step 5: Solve for x
   x = 70,910,546,305,600/3,937,432
6. Step 6: Final answer
   x = 18,009,338.65