Finding the Third Proportional to 5,478 and 12,130.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,478 : 12,130.50 = 12,130.50 : x
2. Step 2: Convert to fraction form
   5,478/12,130.50 = 12,130.50/x
3. Step 3: Cross multiply
   5,478x = 12,130.50 × 12,130.50
4. Step 4: Simplify right side
   5,478x = 147,149,030.25
5. Step 5: Solve for x
   x = 147,149,030.25/5,478
6. Step 6: Final answer
   x = 26,861.82