Finding the Fourth Proportional to 19,991.55, 27,588.68 and 12,930.27

Step by Step Solution

1. Step 1: Write the proportion equation
   19,991.55 : 27,588.68 = 12,930.27 : x
2. Step 2: Convert to fraction form
   19,991.55/27,588.68 = 12,930.27/x
3. Step 3: Cross multiply
   19,991.55x = 27,588.68 × 12,930.27
4. Step 4: Simplify right side
   19,991.55x = 356,729,081.34
5. Step 5: Solve for x
   x = 356,729,081.34/19,991.55
6. Step 6: Final answer
   x = 17,843.99