Finding the Third Proportional to 279,918 and 430,285.50

Step by Step Solution

1. Step 1: Write the proportion equation
   279,918 : 430,285.50 = 430,285.50 : x
2. Step 2: Convert to fraction form
   279,918/430,285.50 = 430,285.50/x
3. Step 3: Cross multiply
   279,918x = 430,285.50 × 430,285.50
4. Step 4: Simplify right side
   279,918x = 185,145,611,510.25
5. Step 5: Solve for x
   x = 185,145,611,510.25/279,918
6. Step 6: Final answer
   x = 661,428.03