Finding the Third Proportional to 431,330 and 907,280

Step by Step Solution

1. Step 1: Write the proportion equation
   431,330 : 907,280 = 907,280 : x
2. Step 2: Convert to fraction form
   431,330/907,280 = 907,280/x
3. Step 3: Cross multiply
   431,330x = 907,280 × 907,280
4. Step 4: Simplify right side
   431,330x = 823,156,998,400
5. Step 5: Solve for x
   x = 823,156,998,400/431,330
6. Step 6: Final answer
   x = 1,908,415.83