Finding the Third Proportional to 387,336 and 528,061

Step by Step Solution

1. Step 1: Write the proportion equation
   387,336 : 528,061 = 528,061 : x
2. Step 2: Convert to fraction form
   387,336/528,061 = 528,061/x
3. Step 3: Cross multiply
   387,336x = 528,061 × 528,061
4. Step 4: Simplify right side
   387,336x = 278,848,419,721
5. Step 5: Solve for x
   x = 278,848,419,721/387,336
6. Step 6: Final answer
   x = 719,913.51