Finding the Third Proportional to 355,288.50 and 546,109.50

Step by Step Solution

1. Step 1: Write the proportion equation
   355,288.50 : 546,109.50 = 546,109.50 : x
2. Step 2: Convert to fraction form
   355,288.50/546,109.50 = 546,109.50/x
3. Step 3: Cross multiply
   355,288.50x = 546,109.50 × 546,109.50
4. Step 4: Simplify right side
   355,288.50x = 298,235,585,990.25
5. Step 5: Solve for x
   x = 298,235,585,990.25/355,288.50
6. Step 6: Final answer
   x = 839,418.07