Finding the Fourth Proportional to 13,058.81, 19,574.80 and 5,158.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,058.81 : 19,574.80 = 5,158.12 : x
2. Step 2: Convert to fraction form
   13,058.81/19,574.80 = 5,158.12/x
3. Step 3: Cross multiply
   13,058.81x = 19,574.80 × 5,158.12
4. Step 4: Simplify right side
   13,058.81x = 100,969,167.38
5. Step 5: Solve for x
   x = 100,969,167.38/13,058.81
6. Step 6: Final answer
   x = 7,731.88