Finding the Third Proportional to 5,919,111 and 12,990,346

Step by Step Solution

1. Step 1: Write the proportion equation
   5,919,111 : 12,990,346 = 12,990,346 : x
2. Step 2: Convert to fraction form
   5,919,111/12,990,346 = 12,990,346/x
3. Step 3: Cross multiply
   5,919,111x = 12,990,346 × 12,990,346
4. Step 4: Simplify right side
   5,919,111x = 168,749,089,199,716
5. Step 5: Solve for x
   x = 168,749,089,199,716/5,919,111
6. Step 6: Final answer
   x = 28,509,194.91