Finding the Third Proportional to 5,387,712 and 8,364,876

Step by Step Solution

1. Step 1: Write the proportion equation
   5,387,712 : 8,364,876 = 8,364,876 : x
2. Step 2: Convert to fraction form
   5,387,712/8,364,876 = 8,364,876/x
3. Step 3: Cross multiply
   5,387,712x = 8,364,876 × 8,364,876
4. Step 4: Simplify right side
   5,387,712x = 69,971,150,495,376
5. Step 5: Solve for x
   x = 69,971,150,495,376/5,387,712
6. Step 6: Final answer
   x = 12,987,173.50