Finding the Third Proportional to 216,278 and 474,658

Step by Step Solution

1. Step 1: Write the proportion equation
   216,278 : 474,658 = 474,658 : x
2. Step 2: Convert to fraction form
   216,278/474,658 = 474,658/x
3. Step 3: Cross multiply
   216,278x = 474,658 × 474,658
4. Step 4: Simplify right side
   216,278x = 225,300,216,964
5. Step 5: Solve for x
   x = 225,300,216,964/216,278
6. Step 6: Final answer
   x = 1,041,715.83