Finding the Third Proportional to 86,971,112 and 186,391,870

Step by Step Solution

1. Step 1: Write the proportion equation
   86,971,112 : 186,391,870 = 186,391,870 : x
2. Step 2: Convert to fraction form
   86,971,112/186,391,870 = 186,391,870/x
3. Step 3: Cross multiply
   86,971,112x = 186,391,870 × 186,391,870
4. Step 4: Simplify right side
   86,971,112x = 34,741,929,202,096,900
5. Step 5: Solve for x
   x = 34,741,929,202,096,900/86,971,112
6. Step 6: Final answer
   x = 399,465,160.36