Finding the Third Proportional to 870,912 and 1,866,240

Step by Step Solution

1. Step 1: Write the proportion equation
   870,912 : 1,866,240 = 1,866,240 : x
2. Step 2: Convert to fraction form
   870,912/1,866,240 = 1,866,240/x
3. Step 3: Cross multiply
   870,912x = 1,866,240 × 1,866,240
4. Step 4: Simplify right side
   870,912x = 3,482,851,737,600
5. Step 5: Solve for x
   x = 3,482,851,737,600/870,912
6. Step 6: Final answer
   x = 3,999,085.71