Finding the Third Proportional to 221,640 and 351,015.75

Step by Step Solution

1. Step 1: Write the proportion equation
   221,640 : 351,015.75 = 351,015.75 : x
2. Step 2: Convert to fraction form
   221,640/351,015.75 = 351,015.75/x
3. Step 3: Cross multiply
   221,640x = 351,015.75 × 351,015.75
4. Step 4: Simplify right side
   221,640x = 123,212,056,748.06
5. Step 5: Solve for x
   x = 123,212,056,748.06/221,640
6. Step 6: Final answer
   x = 555,910.74