Finding the Fourth Proportional to 11,945.25, 17,917.86 and 4,929.21

Step by Step Solution

1. Step 1: Write the proportion equation
   11,945.25 : 17,917.86 = 4,929.21 : x
2. Step 2: Convert to fraction form
   11,945.25/17,917.86 = 4,929.21/x
3. Step 3: Cross multiply
   11,945.25x = 17,917.86 × 4,929.21
4. Step 4: Simplify right side
   11,945.25x = 88,320,894.69
5. Step 5: Solve for x
   x = 88,320,894.69/11,945.25
6. Step 6: Final answer
   x = 7,393.81