Finding the Third Proportional to 238,439 and 521,172

Step by Step Solution

1. Step 1: Write the proportion equation
   238,439 : 521,172 = 521,172 : x
2. Step 2: Convert to fraction form
   238,439/521,172 = 521,172/x
3. Step 3: Cross multiply
   238,439x = 521,172 × 521,172
4. Step 4: Simplify right side
   238,439x = 271,620,253,584
5. Step 5: Solve for x
   x = 271,620,253,584/238,439
6. Step 6: Final answer
   x = 1,139,160.35