Finding the Fourth Proportional to 21,948.82, 30,281.75 and 12,387.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,948.82 : 30,281.75 = 12,387.53 : x
2. Step 2: Convert to fraction form
   21,948.82/30,281.75 = 12,387.53/x
3. Step 3: Cross multiply
   21,948.82x = 30,281.75 × 12,387.53
4. Step 4: Simplify right side
   21,948.82x = 375,116,146.80
5. Step 5: Solve for x
   x = 375,116,146.80/21,948.82
6. Step 6: Final answer
   x = 17,090.49