Finding the Third Proportional to 156,945 and 221,111

Step by Step Solution

1. Step 1: Write the proportion equation
   156,945 : 221,111 = 221,111 : x
2. Step 2: Convert to fraction form
   156,945/221,111 = 221,111/x
3. Step 3: Cross multiply
   156,945x = 221,111 × 221,111
4. Step 4: Simplify right side
   156,945x = 48,890,074,321
5. Step 5: Solve for x
   x = 48,890,074,321/156,945
6. Step 6: Final answer
   x = 311,510.88