Finding the Fourth Proportional to 10,645.86, 15,975.63 and 7,139.83

Step by Step Solution

1. Step 1: Write the proportion equation
   10,645.86 : 15,975.63 = 7,139.83 : x
2. Step 2: Convert to fraction form
   10,645.86/15,975.63 = 7,139.83/x
3. Step 3: Cross multiply
   10,645.86x = 15,975.63 × 7,139.83
4. Step 4: Simplify right side
   10,645.86x = 114,063,246.64
5. Step 5: Solve for x
   x = 114,063,246.64/10,645.86
6. Step 6: Final answer
   x = 10,714.33