Finding the Third Proportional to 139,538.06 and 305,672.81

Step by Step Solution

1. Step 1: Write the proportion equation
   139,538.06 : 305,672.81 = 305,672.81 : x
2. Step 2: Convert to fraction form
   139,538.06/305,672.81 = 305,672.81/x
3. Step 3: Cross multiply
   139,538.06x = 305,672.81 × 305,672.81
4. Step 4: Simplify right side
   139,538.06x = 93,435,868,301.66
5. Step 5: Solve for x
   x = 93,435,868,301.66/139,538.06
6. Step 6: Final answer
   x = 669,608.47