Finding the Third Proportional to 118,453.50 and 256,590

Step by Step Solution

1. Step 1: Write the proportion equation
   118,453.50 : 256,590 = 256,590 : x
2. Step 2: Convert to fraction form
   118,453.50/256,590 = 256,590/x
3. Step 3: Cross multiply
   118,453.50x = 256,590 × 256,590
4. Step 4: Simplify right side
   118,453.50x = 65,838,428,100
5. Step 5: Solve for x
   x = 65,838,428,100/118,453.50
6. Step 6: Final answer
   x = 555,816.65