Finding the Third Proportional to 118,243.50 and 256,581

Step by Step Solution

1. Step 1: Write the proportion equation
   118,243.50 : 256,581 = 256,581 : x
2. Step 2: Convert to fraction form
   118,243.50/256,581 = 256,581/x
3. Step 3: Cross multiply
   118,243.50x = 256,581 × 256,581
4. Step 4: Simplify right side
   118,243.50x = 65,833,809,561
5. Step 5: Solve for x
   x = 65,833,809,561/118,243.50
6. Step 6: Final answer
   x = 556,764.72