Finding the Third Proportional to 139,240 and 298,160

Step by Step Solution

1. Step 1: Write the proportion equation
   139,240 : 298,160 = 298,160 : x
2. Step 2: Convert to fraction form
   139,240/298,160 = 298,160/x
3. Step 3: Cross multiply
   139,240x = 298,160 × 298,160
4. Step 4: Simplify right side
   139,240x = 88,899,385,600
5. Step 5: Solve for x
   x = 88,899,385,600/139,240
6. Step 6: Final answer
   x = 638,461.55