Finding the Third Proportional to 315,480 and 688,060.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,480 : 688,060.50 = 688,060.50 : x
2. Step 2: Convert to fraction form
   315,480/688,060.50 = 688,060.50/x
3. Step 3: Cross multiply
   315,480x = 688,060.50 × 688,060.50
4. Step 4: Simplify right side
   315,480x = 473,427,251,660.25
5. Step 5: Solve for x
   x = 473,427,251,660.25/315,480
6. Step 6: Final answer
   x = 1,500,656.94