Finding the Third Proportional to 431,210 and 907,123

Step by Step Solution

1. Step 1: Write the proportion equation
   431,210 : 907,123 = 907,123 : x
2. Step 2: Convert to fraction form
   431,210/907,123 = 907,123/x
3. Step 3: Cross multiply
   431,210x = 907,123 × 907,123
4. Step 4: Simplify right side
   431,210x = 822,872,137,129
5. Step 5: Solve for x
   x = 822,872,137,129/431,210
6. Step 6: Final answer
   x = 1,908,286.30