Finding the Third Proportional to 397,320 and 870,222

Step by Step Solution

1. Step 1: Write the proportion equation
   397,320 : 870,222 = 870,222 : x
2. Step 2: Convert to fraction form
   397,320/870,222 = 870,222/x
3. Step 3: Cross multiply
   397,320x = 870,222 × 870,222
4. Step 4: Simplify right side
   397,320x = 757,286,329,284
5. Step 5: Solve for x
   x = 757,286,329,284/397,320
6. Step 6: Final answer
   x = 1,905,985.93