Finding the Third Proportional to 870,928 and 1,866,272

Step by Step Solution

1. Step 1: Write the proportion equation
   870,928 : 1,866,272 = 1,866,272 : x
2. Step 2: Convert to fraction form
   870,928/1,866,272 = 1,866,272/x
3. Step 3: Cross multiply
   870,928x = 1,866,272 × 1,866,272
4. Step 4: Simplify right side
   870,928x = 3,482,971,177,984
5. Step 5: Solve for x
   x = 3,482,971,177,984/870,928
6. Step 6: Final answer
   x = 3,999,149.39