Finding the Fourth Proportional to 13,008.51, 19,513.58 and 5,216.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,008.51 : 19,513.58 = 5,216.31 : x
2. Step 2: Convert to fraction form
   13,008.51/19,513.58 = 5,216.31/x
3. Step 3: Cross multiply
   13,008.51x = 19,513.58 × 5,216.31
4. Step 4: Simplify right side
   13,008.51x = 101,788,882.49
5. Step 5: Solve for x
   x = 101,788,882.49/13,008.51
6. Step 6: Final answer
   x = 7,824.79