Finding the Third Proportional to 139,176 and 310,225.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,176 : 310,225.50 = 310,225.50 : x
2. Step 2: Convert to fraction form
   139,176/310,225.50 = 310,225.50/x
3. Step 3: Cross multiply
   139,176x = 310,225.50 × 310,225.50
4. Step 4: Simplify right side
   139,176x = 96,239,860,850.25
5. Step 5: Solve for x
   x = 96,239,860,850.25/139,176
6. Step 6: Final answer
   x = 691,497.53