Finding the Fourth Proportional to 21,185.31, 31,779.18 and 8,037.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,185.31 : 31,779.18 = 8,037.39 : x
2. Step 2: Convert to fraction form
   21,185.31/31,779.18 = 8,037.39/x
3. Step 3: Cross multiply
   21,185.31x = 31,779.18 × 8,037.39
4. Step 4: Simplify right side
   21,185.31x = 255,421,663.54
5. Step 5: Solve for x
   x = 255,421,663.54/21,185.31
6. Step 6: Final answer
   x = 12,056.55