Finding the Fourth Proportional to 21,180.84, 31,774.78 and 7,326.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,180.84 : 31,774.78 = 7,326.60 : x
2. Step 2: Convert to fraction form
   21,180.84/31,774.78 = 7,326.60/x
3. Step 3: Cross multiply
   21,180.84x = 31,774.78 × 7,326.60
4. Step 4: Simplify right side
   21,180.84x = 232,801,103.15
5. Step 5: Solve for x
   x = 232,801,103.15/21,180.84
6. Step 6: Final answer
   x = 10,991.12