Finding the Fourth Proportional to 25,321.78, 34,943.91 and 13,991.28

Step by Step Solution

1. Step 1: Write the proportion equation
   25,321.78 : 34,943.91 = 13,991.28 : x
2. Step 2: Convert to fraction form
   25,321.78/34,943.91 = 13,991.28/x
3. Step 3: Cross multiply
   25,321.78x = 34,943.91 × 13,991.28
4. Step 4: Simplify right side
   25,321.78x = 488,909,784.43
5. Step 5: Solve for x
   x = 488,909,784.43/25,321.78
6. Step 6: Final answer
   x = 19,307.88