Finding the Third Proportional to 279,301.50 and 431,581.50

Step by Step Solution

1. Step 1: Write the proportion equation
   279,301.50 : 431,581.50 = 431,581.50 : x
2. Step 2: Convert to fraction form
   279,301.50/431,581.50 = 431,581.50/x
3. Step 3: Cross multiply
   279,301.50x = 431,581.50 × 431,581.50
4. Step 4: Simplify right side
   279,301.50x = 186,262,591,142.25
5. Step 5: Solve for x
   x = 186,262,591,142.25/279,301.50
6. Step 6: Final answer
   x = 666,887.19