Finding the Third Proportional to 315,495 and 688,090.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,495 : 688,090.50 = 688,090.50 : x
2. Step 2: Convert to fraction form
   315,495/688,090.50 = 688,090.50/x
3. Step 3: Cross multiply
   315,495x = 688,090.50 × 688,090.50
4. Step 4: Simplify right side
   315,495x = 473,468,536,190.25
5. Step 5: Solve for x
   x = 473,468,536,190.25/315,495
6. Step 6: Final answer
   x = 1,500,716.45