Finding the Third Proportional to 12,931,669 and 21,551,881

Step by Step Solution

1. Step 1: Write the proportion equation
   12,931,669 : 21,551,881 = 21,551,881 : x
2. Step 2: Convert to fraction form
   12,931,669/21,551,881 = 21,551,881/x
3. Step 3: Cross multiply
   12,931,669x = 21,551,881 × 21,551,881
4. Step 4: Simplify right side
   12,931,669x = 464,483,574,638,161
5. Step 5: Solve for x
   x = 464,483,574,638,161/12,931,669
6. Step 6: Final answer
   x = 35,918,300.62