Finding the Third Proportional to 111,385.13 and 262,804.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,385.13 : 262,804.50 = 262,804.50 : x
2. Step 2: Convert to fraction form
   111,385.13/262,804.50 = 262,804.50/x
3. Step 3: Cross multiply
   111,385.13x = 262,804.50 × 262,804.50
4. Step 4: Simplify right side
   111,385.13x = 69,066,205,220.25
5. Step 5: Solve for x
   x = 69,066,205,220.25/111,385.13
6. Step 6: Final answer
   x = 620,066.69