Finding the Third Proportional to 29,978,308 and 64,503,380

Step by Step Solution

1. Step 1: Write the proportion equation
   29,978,308 : 64,503,380 = 64,503,380 : x
2. Step 2: Convert to fraction form
   29,978,308/64,503,380 = 64,503,380/x
3. Step 3: Cross multiply
   29,978,308x = 64,503,380 × 64,503,380
4. Step 4: Simplify right side
   29,978,308x = 4,160,686,031,424,400
5. Step 5: Solve for x
   x = 4,160,686,031,424,400/29,978,308
6. Step 6: Final answer
   x = 138,789,888.72