Finding the Third Proportional to 279,259.50 and 431,526

Step by Step Solution

1. Step 1: Write the proportion equation
   279,259.50 : 431,526 = 431,526 : x
2. Step 2: Convert to fraction form
   279,259.50/431,526 = 431,526/x
3. Step 3: Cross multiply
   279,259.50x = 431,526 × 431,526
4. Step 4: Simplify right side
   279,259.50x = 186,214,688,676
5. Step 5: Solve for x
   x = 186,214,688,676/279,259.50
6. Step 6: Final answer
   x = 666,815.95