Finding the Fourth Proportional to 21,381.83, 31,916.17 and 18,856.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,381.83 : 31,916.17 = 18,856.82 : x
2. Step 2: Convert to fraction form
   21,381.83/31,916.17 = 18,856.82/x
3. Step 3: Cross multiply
   21,381.83x = 31,916.17 × 18,856.82
4. Step 4: Simplify right side
   21,381.83x = 601,837,313.20
5. Step 5: Solve for x
   x = 601,837,313.20/21,381.83
6. Step 6: Final answer
   x = 28,147.14