Finding the Fourth Proportional to 19,579.59, 27,028.89 and 13,130.10

Step by Step Solution

1. Step 1: Write the proportion equation
   19,579.59 : 27,028.89 = 13,130.10 : x
2. Step 2: Convert to fraction form
   19,579.59/27,028.89 = 13,130.10/x
3. Step 3: Cross multiply
   19,579.59x = 27,028.89 × 13,130.10
4. Step 4: Simplify right side
   19,579.59x = 354,892,028.59
5. Step 5: Solve for x
   x = 354,892,028.59/19,579.59
6. Step 6: Final answer
   x = 18,125.61