Finding the Third Proportional to 12,840 and 28,045.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,840 : 28,045.50 = 28,045.50 : x
2. Step 2: Convert to fraction form
   12,840/28,045.50 = 28,045.50/x
3. Step 3: Cross multiply
   12,840x = 28,045.50 × 28,045.50
4. Step 4: Simplify right side
   12,840x = 786,550,070.25
5. Step 5: Solve for x
   x = 786,550,070.25/12,840
6. Step 6: Final answer
   x = 61,257.79