Finding the Third Proportional to 188,500.50 and 390,123

Step by Step Solution

1. Step 1: Write the proportion equation
   188,500.50 : 390,123 = 390,123 : x
2. Step 2: Convert to fraction form
   188,500.50/390,123 = 390,123/x
3. Step 3: Cross multiply
   188,500.50x = 390,123 × 390,123
4. Step 4: Simplify right side
   188,500.50x = 152,195,955,129
5. Step 5: Solve for x
   x = 152,195,955,129/188,500.50
6. Step 6: Final answer
   x = 807,403.46