Finding the Fourth Proportional to 12,070, 18,112.56 and 5,144.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,070 : 18,112.56 = 5,144.50 : x
2. Step 2: Convert to fraction form
   12,070/18,112.56 = 5,144.50/x
3. Step 3: Cross multiply
   12,070x = 18,112.56 × 5,144.50
4. Step 4: Simplify right side
   12,070x = 93,180,064.92
5. Step 5: Solve for x
   x = 93,180,064.92/12,070
6. Step 6: Final answer
   x = 7,719.97