Finding the Third Proportional to 17,978,436 and 39,621,438

Step by Step Solution

1. Step 1: Write the proportion equation
   17,978,436 : 39,621,438 = 39,621,438 : x
2. Step 2: Convert to fraction form
   17,978,436/39,621,438 = 39,621,438/x
3. Step 3: Cross multiply
   17,978,436x = 39,621,438 × 39,621,438
4. Step 4: Simplify right side
   17,978,436x = 1,569,858,349,187,844
5. Step 5: Solve for x
   x = 1,569,858,349,187,844/17,978,436
6. Step 6: Final answer
   x = 87,318,960.85