Finding the Fourth Proportional to 13,081.12, 19,623.84 and 5,181.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,081.12 : 19,623.84 = 5,181.28 : x
2. Step 2: Convert to fraction form
   13,081.12/19,623.84 = 5,181.28/x
3. Step 3: Cross multiply
   13,081.12x = 19,623.84 × 5,181.28
4. Step 4: Simplify right side
   13,081.12x = 101,676,609.72
5. Step 5: Solve for x
   x = 101,676,609.72/13,081.12
6. Step 6: Final answer
   x = 7,772.78