Finding the Third Proportional to 315,540 and 692,316

Step by Step Solution

1. Step 1: Write the proportion equation
   315,540 : 692,316 = 692,316 : x
2. Step 2: Convert to fraction form
   315,540/692,316 = 692,316/x
3. Step 3: Cross multiply
   315,540x = 692,316 × 692,316
4. Step 4: Simplify right side
   315,540x = 479,301,443,856
5. Step 5: Solve for x
   x = 479,301,443,856/315,540
6. Step 6: Final answer
   x = 1,518,987.91