Finding the Fourth Proportional to 11,951.31, 17,919.54 and 10,405.83

Step by Step Solution

1. Step 1: Write the proportion equation
   11,951.31 : 17,919.54 = 10,405.83 : x
2. Step 2: Convert to fraction form
   11,951.31/17,919.54 = 10,405.83/x
3. Step 3: Cross multiply
   11,951.31x = 17,919.54 × 10,405.83
4. Step 4: Simplify right side
   11,951.31x = 186,467,686.92
5. Step 5: Solve for x
   x = 186,467,686.92/11,951.31
6. Step 6: Final answer
   x = 15,602.28