Finding the Fourth Proportional to 10,131.40, 15,186.70 and 3,889.73

Step by Step Solution

1. Step 1: Write the proportion equation
   10,131.40 : 15,186.70 = 3,889.73 : x
2. Step 2: Convert to fraction form
   10,131.40/15,186.70 = 3,889.73/x
3. Step 3: Cross multiply
   10,131.40x = 15,186.70 × 3,889.73
4. Step 4: Simplify right side
   10,131.40x = 59,072,205.42
5. Step 5: Solve for x
   x = 59,072,205.42/10,131.40
6. Step 6: Final answer
   x = 5,830.61