Finding the Third Proportional to 380,139.75 and 531,458.72

Step by Step Solution

1. Step 1: Write the proportion equation
   380,139.75 : 531,458.72 = 531,458.72 : x
2. Step 2: Convert to fraction form
   380,139.75/531,458.72 = 531,458.72/x
3. Step 3: Cross multiply
   380,139.75x = 531,458.72 × 531,458.72
4. Step 4: Simplify right side
   380,139.75x = 282,448,369,735.39
5. Step 5: Solve for x
   x = 282,448,369,735.39/380,139.75
6. Step 6: Final answer
   x = 743,011.93