Finding the Third Proportional to 291,156.75 and 636,288

Step by Step Solution

1. Step 1: Write the proportion equation
   291,156.75 : 636,288 = 636,288 : x
2. Step 2: Convert to fraction form
   291,156.75/636,288 = 636,288/x
3. Step 3: Cross multiply
   291,156.75x = 636,288 × 636,288
4. Step 4: Simplify right side
   291,156.75x = 404,862,418,944
5. Step 5: Solve for x
   x = 404,862,418,944/291,156.75
6. Step 6: Final answer
   x = 1,390,530.77