Finding the Fourth Proportional to 21,018.87, 31,495.46 and 17,886.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.87 : 31,495.46 = 17,886.06 : x
2. Step 2: Convert to fraction form
   21,018.87/31,495.46 = 17,886.06/x
3. Step 3: Cross multiply
   21,018.87x = 31,495.46 × 17,886.06
4. Step 4: Simplify right side
   21,018.87x = 563,329,597.86
5. Step 5: Solve for x
   x = 563,329,597.86/21,018.87
6. Step 6: Final answer
   x = 26,801.14