Finding the Fourth Proportional to 25,421.50, 35,081.67 and 15,485.50

Step by Step Solution

1. Step 1: Write the proportion equation
   25,421.50 : 35,081.67 = 15,485.50 : x
2. Step 2: Convert to fraction form
   25,421.50/35,081.67 = 15,485.50/x
3. Step 3: Cross multiply
   25,421.50x = 35,081.67 × 15,485.50
4. Step 4: Simplify right side
   25,421.50x = 543,257,200.79
5. Step 5: Solve for x
   x = 543,257,200.79/25,421.50
6. Step 6: Final answer
   x = 21,369.99