Finding the Third Proportional to 216,139.50 and 347,274

Step by Step Solution

1. Step 1: Write the proportion equation
   216,139.50 : 347,274 = 347,274 : x
2. Step 2: Convert to fraction form
   216,139.50/347,274 = 347,274/x
3. Step 3: Cross multiply
   216,139.50x = 347,274 × 347,274
4. Step 4: Simplify right side
   216,139.50x = 120,599,231,076
5. Step 5: Solve for x
   x = 120,599,231,076/216,139.50
6. Step 6: Final answer
   x = 557,969.42