Finding the Fourth Proportional to 21,045.91, 31,414.81 and 18,554.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,045.91 : 31,414.81 = 18,554.86 : x
2. Step 2: Convert to fraction form
   21,045.91/31,414.81 = 18,554.86/x
3. Step 3: Cross multiply
   21,045.91x = 31,414.81 × 18,554.86
4. Step 4: Simplify right side
   21,045.91x = 582,897,401.48
5. Step 5: Solve for x
   x = 582,897,401.48/21,045.91
6. Step 6: Final answer
   x = 27,696.47