Finding the Third Proportional to 121,390 and 266,870

Step by Step Solution

1. Step 1: Write the proportion equation
   121,390 : 266,870 = 266,870 : x
2. Step 2: Convert to fraction form
   121,390/266,870 = 266,870/x
3. Step 3: Cross multiply
   121,390x = 266,870 × 266,870
4. Step 4: Simplify right side
   121,390x = 71,219,596,900
5. Step 5: Solve for x
   x = 71,219,596,900/121,390
6. Step 6: Final answer
   x = 586,700.69