Finding the Fourth Proportional to 11,900.31, 16,405.70 and 8,537.49

Step by Step Solution

1. Step 1: Write the proportion equation
   11,900.31 : 16,405.70 = 8,537.49 : x
2. Step 2: Convert to fraction form
   11,900.31/16,405.70 = 8,537.49/x
3. Step 3: Cross multiply
   11,900.31x = 16,405.70 × 8,537.49
4. Step 4: Simplify right side
   11,900.31x = 140,063,499.69
5. Step 5: Solve for x
   x = 140,063,499.69/11,900.31
6. Step 6: Final answer
   x = 11,769.74