Finding the Third Proportional to 7,810.50 and 12,492

Step by Step Solution

1. Step 1: Write the proportion equation
   7,810.50 : 12,492 = 12,492 : x
2. Step 2: Convert to fraction form
   7,810.50/12,492 = 12,492/x
3. Step 3: Cross multiply
   7,810.50x = 12,492 × 12,492
4. Step 4: Simplify right side
   7,810.50x = 156,050,064
5. Step 5: Solve for x
   x = 156,050,064/7,810.50
6. Step 6: Final answer
   x = 19,979.52