Finding the Fourth Proportional to 17,020.42, 25,521.99 and 7,778.50

Step by Step Solution

1. Step 1: Write the proportion equation
   17,020.42 : 25,521.99 = 7,778.50 : x
2. Step 2: Convert to fraction form
   17,020.42/25,521.99 = 7,778.50/x
3. Step 3: Cross multiply
   17,020.42x = 25,521.99 × 7,778.50
4. Step 4: Simplify right side
   17,020.42x = 198,522,799.22
5. Step 5: Solve for x
   x = 198,522,799.22/17,020.42
6. Step 6: Final answer
   x = 11,663.80