Finding the Third Proportional to 315,492 and 688,084.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,492 : 688,084.50 = 688,084.50 : x
2. Step 2: Convert to fraction form
   315,492/688,084.50 = 688,084.50/x
3. Step 3: Cross multiply
   315,492x = 688,084.50 × 688,084.50
4. Step 4: Simplify right side
   315,492x = 473,460,279,140.25
5. Step 5: Solve for x
   x = 473,460,279,140.25/315,492
6. Step 6: Final answer
   x = 1,500,704.55