Finding the Third Proportional to 318,658.50 and 693,513

Step by Step Solution

1. Step 1: Write the proportion equation
   318,658.50 : 693,513 = 693,513 : x
2. Step 2: Convert to fraction form
   318,658.50/693,513 = 693,513/x
3. Step 3: Cross multiply
   318,658.50x = 693,513 × 693,513
4. Step 4: Simplify right side
   318,658.50x = 480,960,281,169
5. Step 5: Solve for x
   x = 480,960,281,169/318,658.50
6. Step 6: Final answer
   x = 1,509,328.27