Finding the Third Proportional to 78,907.50 and 110,989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,907.50 : 110,989.50 = 110,989.50 : x
2. Step 2: Convert to fraction form
   78,907.50/110,989.50 = 110,989.50/x
3. Step 3: Cross multiply
   78,907.50x = 110,989.50 × 110,989.50
4. Step 4: Simplify right side
   78,907.50x = 12,318,669,110.25
5. Step 5: Solve for x
   x = 12,318,669,110.25/78,907.50
6. Step 6: Final answer
   x = 156,115.31