Finding the Fourth Proportional to 21,812.59, 30,100.58 and 13,328.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,812.59 : 30,100.58 = 13,328.91 : x
2. Step 2: Convert to fraction form
   21,812.59/30,100.58 = 13,328.91/x
3. Step 3: Cross multiply
   21,812.59x = 30,100.58 × 13,328.91
4. Step 4: Simplify right side
   21,812.59x = 401,207,954.39
5. Step 5: Solve for x
   x = 401,207,954.39/21,812.59
6. Step 6: Final answer
   x = 18,393.41