Finding the Third Proportional to 311,799 and 666,244.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,799 : 666,244.50 = 666,244.50 : x
2. Step 2: Convert to fraction form
   311,799/666,244.50 = 666,244.50/x
3. Step 3: Cross multiply
   311,799x = 666,244.50 × 666,244.50
4. Step 4: Simplify right side
   311,799x = 443,881,733,780.25
5. Step 5: Solve for x
   x = 443,881,733,780.25/311,799
6. Step 6: Final answer
   x = 1,423,615.00