Finding the Third Proportional to 291,141 and 636,258

Step by Step Solution

1. Step 1: Write the proportion equation
   291,141 : 636,258 = 636,258 : x
2. Step 2: Convert to fraction form
   291,141/636,258 = 636,258/x
3. Step 3: Cross multiply
   291,141x = 636,258 × 636,258
4. Step 4: Simplify right side
   291,141x = 404,824,242,564
5. Step 5: Solve for x
   x = 404,824,242,564/291,141
6. Step 6: Final answer
   x = 1,390,474.86