Finding the Third Proportional to 353,139 and 537,868.50

Step by Step Solution

1. Step 1: Write the proportion equation
   353,139 : 537,868.50 = 537,868.50 : x
2. Step 2: Convert to fraction form
   353,139/537,868.50 = 537,868.50/x
3. Step 3: Cross multiply
   353,139x = 537,868.50 × 537,868.50
4. Step 4: Simplify right side
   353,139x = 289,302,523,292.25
5. Step 5: Solve for x
   x = 289,302,523,292.25/353,139
6. Step 6: Final answer
   x = 819,231.30