Finding the Third Proportional to 90,570 and 198,979.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,570 : 198,979.50 = 198,979.50 : x
2. Step 2: Convert to fraction form
   90,570/198,979.50 = 198,979.50/x
3. Step 3: Cross multiply
   90,570x = 198,979.50 × 198,979.50
4. Step 4: Simplify right side
   90,570x = 39,592,841,420.25
5. Step 5: Solve for x
   x = 39,592,841,420.25/90,570
6. Step 6: Final answer
   x = 437,151.83