Finding the Fourth Proportional to 25,321.55, 34,945.39 and 13,991.05

Step by Step Solution

1. Step 1: Write the proportion equation
   25,321.55 : 34,945.39 = 13,991.05 : x
2. Step 2: Convert to fraction form
   25,321.55/34,945.39 = 13,991.05/x
3. Step 3: Cross multiply
   25,321.55x = 34,945.39 × 13,991.05
4. Step 4: Simplify right side
   25,321.55x = 488,922,576.42
5. Step 5: Solve for x
   x = 488,922,576.42/25,321.55
6. Step 6: Final answer
   x = 19,308.55