Finding the Third Proportional to 86,710.50 and 189,990.56

Step by Step Solution

1. Step 1: Write the proportion equation
   86,710.50 : 189,990.56 = 189,990.56 : x
2. Step 2: Convert to fraction form
   86,710.50/189,990.56 = 189,990.56/x
3. Step 3: Cross multiply
   86,710.50x = 189,990.56 × 189,990.56
4. Step 4: Simplify right side
   86,710.50x = 36,096,413,839.07
5. Step 5: Solve for x
   x = 36,096,413,839.07/86,710.50
6. Step 6: Final answer
   x = 416,286.54