Finding the Third Proportional to 272,166 and 423,156

Step by Step Solution

1. Step 1: Write the proportion equation
   272,166 : 423,156 = 423,156 : x
2. Step 2: Convert to fraction form
   272,166/423,156 = 423,156/x
3. Step 3: Cross multiply
   272,166x = 423,156 × 423,156
4. Step 4: Simplify right side
   272,166x = 179,061,000,336
5. Step 5: Solve for x
   x = 179,061,000,336/272,166
6. Step 6: Final answer
   x = 657,910.98