Finding the Third Proportional to 139,200 and 298,080

Step by Step Solution

1. Step 1: Write the proportion equation
   139,200 : 298,080 = 298,080 : x
2. Step 2: Convert to fraction form
   139,200/298,080 = 298,080/x
3. Step 3: Cross multiply
   139,200x = 298,080 × 298,080
4. Step 4: Simplify right side
   139,200x = 88,851,686,400
5. Step 5: Solve for x
   x = 88,851,686,400/139,200
6. Step 6: Final answer
   x = 638,302.34