Finding the Fourth Proportional to 19,980.47, 27,583.07 and 12,429.25

Step by Step Solution

1. Step 1: Write the proportion equation
   19,980.47 : 27,583.07 = 12,429.25 : x
2. Step 2: Convert to fraction form
   19,980.47/27,583.07 = 12,429.25/x
3. Step 3: Cross multiply
   19,980.47x = 27,583.07 × 12,429.25
4. Step 4: Simplify right side
   19,980.47x = 342,836,741.69
5. Step 5: Solve for x
   x = 342,836,741.69/19,980.47
6. Step 6: Final answer
   x = 17,158.59