Finding the Third Proportional to 434,412 and 636,090

Step by Step Solution

1. Step 1: Write the proportion equation
   434,412 : 636,090 = 636,090 : x
2. Step 2: Convert to fraction form
   434,412/636,090 = 636,090/x
3. Step 3: Cross multiply
   434,412x = 636,090 × 636,090
4. Step 4: Simplify right side
   434,412x = 404,610,488,100
5. Step 5: Solve for x
   x = 404,610,488,100/434,412
6. Step 6: Final answer
   x = 931,398.05