Finding the Fourth Proportional to 21,211.31, 31,804.82 and 8,739.93

Step by Step Solution

1. Step 1: Write the proportion equation
   21,211.31 : 31,804.82 = 8,739.93 : x
2. Step 2: Convert to fraction form
   21,211.31/31,804.82 = 8,739.93/x
3. Step 3: Cross multiply
   21,211.31x = 31,804.82 × 8,739.93
4. Step 4: Simplify right side
   21,211.31x = 277,971,856.76
5. Step 5: Solve for x
   x = 277,971,856.76/21,211.31
6. Step 6: Final answer
   x = 13,104.89