Finding the Third Proportional to 86,971,128 and 186,391,900

Step by Step Solution

1. Step 1: Write the proportion equation
   86,971,128 : 186,391,900 = 186,391,900 : x
2. Step 2: Convert to fraction form
   86,971,128/186,391,900 = 186,391,900/x
3. Step 3: Cross multiply
   86,971,128x = 186,391,900 × 186,391,900
4. Step 4: Simplify right side
   86,971,128x = 34,741,940,385,610,000
5. Step 5: Solve for x
   x = 34,741,940,385,610,000/86,971,128
6. Step 6: Final answer
   x = 399,465,215.46