Finding the Third Proportional to 78,340.50 and 170,640

Step by Step Solution

1. Step 1: Write the proportion equation
   78,340.50 : 170,640 = 170,640 : x
2. Step 2: Convert to fraction form
   78,340.50/170,640 = 170,640/x
3. Step 3: Cross multiply
   78,340.50x = 170,640 × 170,640
4. Step 4: Simplify right side
   78,340.50x = 29,118,009,600
5. Step 5: Solve for x
   x = 29,118,009,600/78,340.50
6. Step 6: Final answer
   x = 371,685.27