Finding the Third Proportional to 1,390,860 and 2,981,328

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390,860 : 2,981,328 = 2,981,328 : x
2. Step 2: Convert to fraction form
   1,390,860/2,981,328 = 2,981,328/x
3. Step 3: Cross multiply
   1,390,860x = 2,981,328 × 2,981,328
4. Step 4: Simplify right side
   1,390,860x = 8,888,316,643,584
5. Step 5: Solve for x
   x = 8,888,316,643,584/1,390,860
6. Step 6: Final answer
   x = 6,390,518.56