Finding the Third Proportional to 139,557.38 and 305,710.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,557.38 : 305,710.88 = 305,710.88 : x
2. Step 2: Convert to fraction form
   139,557.38/305,710.88 = 305,710.88/x
3. Step 3: Cross multiply
   139,557.38x = 305,710.88 × 305,710.88
4. Step 4: Simplify right side
   139,557.38x = 93,459,139,093.27
5. Step 5: Solve for x
   x = 93,459,139,093.27/139,557.38
6. Step 6: Final answer
   x = 669,682.55