Finding the Third Proportional to 139,174 and 310,222

Step by Step Solution

1. Step 1: Write the proportion equation
   139,174 : 310,222 = 310,222 : x
2. Step 2: Convert to fraction form
   139,174/310,222 = 310,222/x
3. Step 3: Cross multiply
   139,174x = 310,222 × 310,222
4. Step 4: Simplify right side
   139,174x = 96,237,689,284
5. Step 5: Solve for x
   x = 96,237,689,284/139,174
6. Step 6: Final answer
   x = 691,491.87