Finding the Third Proportional to 279,085.50 and 611,365.50

Step by Step Solution

1. Step 1: Write the proportion equation
   279,085.50 : 611,365.50 = 611,365.50 : x
2. Step 2: Convert to fraction form
   279,085.50/611,365.50 = 611,365.50/x
3. Step 3: Cross multiply
   279,085.50x = 611,365.50 × 611,365.50
4. Step 4: Simplify right side
   279,085.50x = 373,767,774,590.25
5. Step 5: Solve for x
   x = 373,767,774,590.25/279,085.50
6. Step 6: Final answer
   x = 1,339,259.02