Finding the Third Proportional to 89,140.50 and 189,729

Step by Step Solution

1. Step 1: Write the proportion equation
   89,140.50 : 189,729 = 189,729 : x
2. Step 2: Convert to fraction form
   89,140.50/189,729 = 189,729/x
3. Step 3: Cross multiply
   89,140.50x = 189,729 × 189,729
4. Step 4: Simplify right side
   89,140.50x = 35,997,093,441
5. Step 5: Solve for x
   x = 35,997,093,441/89,140.50
6. Step 6: Final answer
   x = 403,824.23