Finding the Fourth Proportional to 13,320, 19,980.96 and 5,112

Step by Step Solution

1. Step 1: Write the proportion equation
   13,320 : 19,980.96 = 5,112 : x
2. Step 2: Convert to fraction form
   13,320/19,980.96 = 5,112/x
3. Step 3: Cross multiply
   13,320x = 19,980.96 × 5,112
4. Step 4: Simplify right side
   13,320x = 102,142,667.52
5. Step 5: Solve for x
   x = 102,142,667.52/13,320
6. Step 6: Final answer
   x = 7,668.37