Finding the Third Proportional to 111,287.50 and 262,444.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,287.50 : 262,444.50 = 262,444.50 : x
2. Step 2: Convert to fraction form
   111,287.50/262,444.50 = 262,444.50/x
3. Step 3: Cross multiply
   111,287.50x = 262,444.50 × 262,444.50
4. Step 4: Simplify right side
   111,287.50x = 68,877,115,580.25
5. Step 5: Solve for x
   x = 68,877,115,580.25/111,287.50
6. Step 6: Final answer
   x = 618,911.52