Finding the Third Proportional to 29,978,318 and 64,503,400

Step by Step Solution

1. Step 1: Write the proportion equation
   29,978,318 : 64,503,400 = 64,503,400 : x
2. Step 2: Convert to fraction form
   29,978,318/64,503,400 = 64,503,400/x
3. Step 3: Cross multiply
   29,978,318x = 64,503,400 × 64,503,400
4. Step 4: Simplify right side
   29,978,318x = 4,160,688,611,560,000
5. Step 5: Solve for x
   x = 4,160,688,611,560,000/29,978,318
6. Step 6: Final answer
   x = 138,789,928.49