Finding the Fourth Proportional to 21,238.02, 31,677.81 and 18,442.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,238.02 : 31,677.81 = 18,442.71 : x
2. Step 2: Convert to fraction form
   21,238.02/31,677.81 = 18,442.71/x
3. Step 3: Cross multiply
   21,238.02x = 31,677.81 × 18,442.71
4. Step 4: Simplify right side
   21,238.02x = 584,224,663.27
5. Step 5: Solve for x
   x = 584,224,663.27/21,238.02
6. Step 6: Final answer
   x = 27,508.43