Finding the Third Proportional to 191,460 and 317,990

Step by Step Solution

1. Step 1: Write the proportion equation
   191,460 : 317,990 = 317,990 : x
2. Step 2: Convert to fraction form
   191,460/317,990 = 317,990/x
3. Step 3: Cross multiply
   191,460x = 317,990 × 317,990
4. Step 4: Simplify right side
   191,460x = 101,117,640,100
5. Step 5: Solve for x
   x = 101,117,640,100/191,460
6. Step 6: Final answer
   x = 528,139.77