Finding the Third Proportional to 1,387,200 and 2,981,328

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387,200 : 2,981,328 = 2,981,328 : x
2. Step 2: Convert to fraction form
   1,387,200/2,981,328 = 2,981,328/x
3. Step 3: Cross multiply
   1,387,200x = 2,981,328 × 2,981,328
4. Step 4: Simplify right side
   1,387,200x = 8,888,316,643,584
5. Step 5: Solve for x
   x = 8,888,316,643,584/1,387,200
6. Step 6: Final answer
   x = 6,407,379.36