Finding the Third Proportional to 299,407.50 and 638,010

Step by Step Solution

1. Step 1: Write the proportion equation
   299,407.50 : 638,010 = 638,010 : x
2. Step 2: Convert to fraction form
   299,407.50/638,010 = 638,010/x
3. Step 3: Cross multiply
   299,407.50x = 638,010 × 638,010
4. Step 4: Simplify right side
   299,407.50x = 407,056,760,100
5. Step 5: Solve for x
   x = 407,056,760,100/299,407.50
6. Step 6: Final answer
   x = 1,359,540.96