Finding the Third Proportional to 638,570 and 852,091

Step by Step Solution

1. Step 1: Write the proportion equation
   638,570 : 852,091 = 852,091 : x
2. Step 2: Convert to fraction form
   638,570/852,091 = 852,091/x
3. Step 3: Cross multiply
   638,570x = 852,091 × 852,091
4. Step 4: Simplify right side
   638,570x = 726,059,072,281
5. Step 5: Solve for x
   x = 726,059,072,281/638,570
6. Step 6: Final answer
   x = 1,137,007.80