Finding the Third Proportional to 139,799.25 and 299,190

Step by Step Solution

1. Step 1: Write the proportion equation
   139,799.25 : 299,190 = 299,190 : x
2. Step 2: Convert to fraction form
   139,799.25/299,190 = 299,190/x
3. Step 3: Cross multiply
   139,799.25x = 299,190 × 299,190
4. Step 4: Simplify right side
   139,799.25x = 89,514,656,100
5. Step 5: Solve for x
   x = 89,514,656,100/139,799.25
6. Step 6: Final answer
   x = 640,308.56