Finding the Third Proportional to 7,858 and 12,060.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,858 : 12,060.50 = 12,060.50 : x
2. Step 2: Convert to fraction form
   7,858/12,060.50 = 12,060.50/x
3. Step 3: Cross multiply
   7,858x = 12,060.50 × 12,060.50
4. Step 4: Simplify right side
   7,858x = 145,455,660.25
5. Step 5: Solve for x
   x = 145,455,660.25/7,858
6. Step 6: Final answer
   x = 18,510.52