Finding the Third Proportional to 188,815.50 and 399,501

Step by Step Solution

1. Step 1: Write the proportion equation
   188,815.50 : 399,501 = 399,501 : x
2. Step 2: Convert to fraction form
   188,815.50/399,501 = 399,501/x
3. Step 3: Cross multiply
   188,815.50x = 399,501 × 399,501
4. Step 4: Simplify right side
   188,815.50x = 159,601,049,001
5. Step 5: Solve for x
   x = 159,601,049,001/188,815.50
6. Step 6: Final answer
   x = 845,275.14