Finding the Third Proportional to 191,456 and 317,985

Step by Step Solution

1. Step 1: Write the proportion equation
   191,456 : 317,985 = 317,985 : x
2. Step 2: Convert to fraction form
   191,456/317,985 = 317,985/x
3. Step 3: Cross multiply
   191,456x = 317,985 × 317,985
4. Step 4: Simplify right side
   191,456x = 101,114,460,225
5. Step 5: Solve for x
   x = 101,114,460,225/191,456
6. Step 6: Final answer
   x = 528,134.19