Finding the Fourth Proportional to 9,991.35, 13,789.98 and 5,959.17

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.35 : 13,789.98 = 5,959.17 : x
2. Step 2: Convert to fraction form
   9,991.35/13,789.98 = 5,959.17/x
3. Step 3: Cross multiply
   9,991.35x = 13,789.98 × 5,959.17
4. Step 4: Simplify right side
   9,991.35x = 82,176,835.12
5. Step 5: Solve for x
   x = 82,176,835.12/9,991.35
6. Step 6: Final answer
   x = 8,224.80