Finding the Fourth Proportional to 9,990.82, 13,787.79 and 5,743.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.82 : 13,787.79 = 5,743.26 : x
2. Step 2: Convert to fraction form
   9,990.82/13,787.79 = 5,743.26/x
3. Step 3: Cross multiply
   9,990.82x = 13,787.79 × 5,743.26
4. Step 4: Simplify right side
   9,990.82x = 79,186,789.55
5. Step 5: Solve for x
   x = 79,186,789.55/9,990.82
6. Step 6: Final answer
   x = 7,925.96