Finding the Third Proportional to 13,199,780 and 21,003,656

Step by Step Solution

1. Step 1: Write the proportion equation
   13,199,780 : 21,003,656 = 21,003,656 : x
2. Step 2: Convert to fraction form
   13,199,780/21,003,656 = 21,003,656/x
3. Step 3: Cross multiply
   13,199,780x = 21,003,656 × 21,003,656
4. Step 4: Simplify right side
   13,199,780x = 441,153,565,366,336
5. Step 5: Solve for x
   x = 441,153,565,366,336/13,199,780
6. Step 6: Final answer
   x = 33,421,281.67