Finding the Third Proportional to 90,316 and 139,570

Step by Step Solution

1. Step 1: Write the proportion equation
   90,316 : 139,570 = 139,570 : x
2. Step 2: Convert to fraction form
   90,316/139,570 = 139,570/x
3. Step 3: Cross multiply
   90,316x = 139,570 × 139,570
4. Step 4: Simplify right side
   90,316x = 19,479,784,900
5. Step 5: Solve for x
   x = 19,479,784,900/90,316
6. Step 6: Final answer
   x = 215,684.76