Finding the Third Proportional to 299,803.50 and 644,076

Step by Step Solution

1. Step 1: Write the proportion equation
   299,803.50 : 644,076 = 644,076 : x
2. Step 2: Convert to fraction form
   299,803.50/644,076 = 644,076/x
3. Step 3: Cross multiply
   299,803.50x = 644,076 × 644,076
4. Step 4: Simplify right side
   299,803.50x = 414,833,893,776
5. Step 5: Solve for x
   x = 414,833,893,776/299,803.50
6. Step 6: Final answer
   x = 1,383,685.96