Finding the Fourth Proportional to 11,865.33, 17,787.42 and 5,621.45

Step by Step Solution

1. Step 1: Write the proportion equation
   11,865.33 : 17,787.42 = 5,621.45 : x
2. Step 2: Convert to fraction form
   11,865.33/17,787.42 = 5,621.45/x
3. Step 3: Cross multiply
   11,865.33x = 17,787.42 × 5,621.45
4. Step 4: Simplify right side
   11,865.33x = 99,991,003.22
5. Step 5: Solve for x
   x = 99,991,003.22/11,865.33
6. Step 6: Final answer
   x = 8,427.16