Finding the Third Proportional to 156,316 and 318,156

Step by Step Solution

1. Step 1: Write the proportion equation
   156,316 : 318,156 = 318,156 : x
2. Step 2: Convert to fraction form
   156,316/318,156 = 318,156/x
3. Step 3: Cross multiply
   156,316x = 318,156 × 318,156
4. Step 4: Simplify right side
   156,316x = 101,223,240,336
5. Step 5: Solve for x
   x = 101,223,240,336/156,316
6. Step 6: Final answer
   x = 647,555.21