Finding the Third Proportional to 78,287 and 111,915.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,287 : 111,915.50 = 111,915.50 : x
2. Step 2: Convert to fraction form
   78,287/111,915.50 = 111,915.50/x
3. Step 3: Cross multiply
   78,287x = 111,915.50 × 111,915.50
4. Step 4: Simplify right side
   78,287x = 12,525,079,140.25
5. Step 5: Solve for x
   x = 12,525,079,140.25/78,287
6. Step 6: Final answer
   x = 159,989.26