Finding the Fourth Proportional to 13,145.21, 19,718.18 and 5,354.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,145.21 : 19,718.18 = 5,354.09 : x
2. Step 2: Convert to fraction form
   13,145.21/19,718.18 = 5,354.09/x
3. Step 3: Cross multiply
   13,145.21x = 19,718.18 × 5,354.09
4. Step 4: Simplify right side
   13,145.21x = 105,572,883.59
5. Step 5: Solve for x
   x = 105,572,883.59/13,145.21
6. Step 6: Final answer
   x = 8,031.28