Finding the Third Proportional to 505,485 and 760,279.50

Step by Step Solution

1. Step 1: Write the proportion equation
   505,485 : 760,279.50 = 760,279.50 : x
2. Step 2: Convert to fraction form
   505,485/760,279.50 = 760,279.50/x
3. Step 3: Cross multiply
   505,485x = 760,279.50 × 760,279.50
4. Step 4: Simplify right side
   505,485x = 578,024,918,120.25
5. Step 5: Solve for x
   x = 578,024,918,120.25/505,485
6. Step 6: Final answer
   x = 1,143,505.58