Finding the Third Proportional to 285,186 and 398,731.50

Step by Step Solution

1. Step 1: Write the proportion equation
   285,186 : 398,731.50 = 398,731.50 : x
2. Step 2: Convert to fraction form
   285,186/398,731.50 = 398,731.50/x
3. Step 3: Cross multiply
   285,186x = 398,731.50 × 398,731.50
4. Step 4: Simplify right side
   285,186x = 158,986,809,092.25
5. Step 5: Solve for x
   x = 158,986,809,092.25/285,186
6. Step 6: Final answer
   x = 557,484.62