Finding the Third Proportional to 7,985.58 and 12,311.55

Step by Step Solution

1. Step 1: Write the proportion equation
   7,985.58 : 12,311.55 = 12,311.55 : x
2. Step 2: Convert to fraction form
   7,985.58/12,311.55 = 12,311.55/x
3. Step 3: Cross multiply
   7,985.58x = 12,311.55 × 12,311.55
4. Step 4: Simplify right side
   7,985.58x = 151,574,144.37
5. Step 5: Solve for x
   x = 151,574,144.37/7,985.58
6. Step 6: Final answer
   x = 18,980.98