Finding the Fourth Proportional to 10,707.75, 14,781.83 and 7,128.68

Step by Step Solution

1. Step 1: Write the proportion equation
   10,707.75 : 14,781.83 = 7,128.68 : x
2. Step 2: Convert to fraction form
   10,707.75/14,781.83 = 7,128.68/x
3. Step 3: Cross multiply
   10,707.75x = 14,781.83 × 7,128.68
4. Step 4: Simplify right side
   10,707.75x = 105,374,826.33
5. Step 5: Solve for x
   x = 105,374,826.33/10,707.75
6. Step 6: Final answer
   x = 9,840.99