Finding the Fourth Proportional to 21,152.84, 29,187.06 and 12,766.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,152.84 : 29,187.06 = 12,766.28 : x
2. Step 2: Convert to fraction form
   21,152.84/29,187.06 = 12,766.28/x
3. Step 3: Cross multiply
   21,152.84x = 29,187.06 × 12,766.28
4. Step 4: Simplify right side
   21,152.84x = 372,610,180.34
5. Step 5: Solve for x
   x = 372,610,180.34/21,152.84
6. Step 6: Final answer
   x = 17,615.14