Finding the Fourth Proportional to 21,897.54, 32,831.33 and 7,857.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,897.54 : 32,831.33 = 7,857.25 : x
2. Step 2: Convert to fraction form
   21,897.54/32,831.33 = 7,857.25/x
3. Step 3: Cross multiply
   21,897.54x = 32,831.33 × 7,857.25
4. Step 4: Simplify right side
   21,897.54x = 257,964,030.95
5. Step 5: Solve for x
   x = 257,964,030.95/21,897.54
6. Step 6: Final answer
   x = 11,780.50