Finding the Third Proportional to 1,388,688 and 2,164,222

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,688 : 2,164,222 = 2,164,222 : x
2. Step 2: Convert to fraction form
   1,388,688/2,164,222 = 2,164,222/x
3. Step 3: Cross multiply
   1,388,688x = 2,164,222 × 2,164,222
4. Step 4: Simplify right side
   1,388,688x = 4,683,856,865,284
5. Step 5: Solve for x
   x = 4,683,856,865,284/1,388,688
6. Step 6: Final answer
   x = 3,372,864.79