Finding the Fourth Proportional to 21,841.17, 30,139.86 and 13,357.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,841.17 : 30,139.86 = 13,357.53 : x
2. Step 2: Convert to fraction form
   21,841.17/30,139.86 = 13,357.53/x
3. Step 3: Cross multiply
   21,841.17x = 30,139.86 × 13,357.53
4. Step 4: Simplify right side
   21,841.17x = 402,594,084.15
5. Step 5: Solve for x
   x = 402,594,084.15/21,841.17
6. Step 6: Final answer
   x = 18,432.81