Finding the Third Proportional to 4,218,798 and 8,736,672

Step by Step Solution

1. Step 1: Write the proportion equation
   4,218,798 : 8,736,672 = 8,736,672 : x
2. Step 2: Convert to fraction form
   4,218,798/8,736,672 = 8,736,672/x
3. Step 3: Cross multiply
   4,218,798x = 8,736,672 × 8,736,672
4. Step 4: Simplify right side
   4,218,798x = 76,329,437,635,584
5. Step 5: Solve for x
   x = 76,329,437,635,584/4,218,798
6. Step 6: Final answer
   x = 18,092,697.88