Finding the Third Proportional to 139,088 and 304,420

Step by Step Solution

1. Step 1: Write the proportion equation
   139,088 : 304,420 = 304,420 : x
2. Step 2: Convert to fraction form
   139,088/304,420 = 304,420/x
3. Step 3: Cross multiply
   139,088x = 304,420 × 304,420
4. Step 4: Simplify right side
   139,088x = 92,671,536,400
5. Step 5: Solve for x
   x = 92,671,536,400/139,088
6. Step 6: Final answer
   x = 666,279.88