Finding the Third Proportional to 612,412 and 870,988

Step by Step Solution

1. Step 1: Write the proportion equation
   612,412 : 870,988 = 870,988 : x
2. Step 2: Convert to fraction form
   612,412/870,988 = 870,988/x
3. Step 3: Cross multiply
   612,412x = 870,988 × 870,988
4. Step 4: Simplify right side
   612,412x = 758,620,096,144
5. Step 5: Solve for x
   x = 758,620,096,144/612,412
6. Step 6: Final answer
   x = 1,238,741.40