Finding the Third Proportional to 254,359.50 and 393,490

Step by Step Solution

1. Step 1: Write the proportion equation
   254,359.50 : 393,490 = 393,490 : x
2. Step 2: Convert to fraction form
   254,359.50/393,490 = 393,490/x
3. Step 3: Cross multiply
   254,359.50x = 393,490 × 393,490
4. Step 4: Simplify right side
   254,359.50x = 154,834,380,100
5. Step 5: Solve for x
   x = 154,834,380,100/254,359.50
6. Step 6: Final answer
   x = 608,722.62