Finding the Fourth Proportional to 25,320.59, 34,942.21 and 13,990.05

Step by Step Solution

1. Step 1: Write the proportion equation
   25,320.59 : 34,942.21 = 13,990.05 : x
2. Step 2: Convert to fraction form
   25,320.59/34,942.21 = 13,990.05/x
3. Step 3: Cross multiply
   25,320.59x = 34,942.21 × 13,990.05
4. Step 4: Simplify right side
   25,320.59x = 488,843,230.04
5. Step 5: Solve for x
   x = 488,843,230.04/25,320.59
6. Step 6: Final answer
   x = 19,306.16