Finding the Fourth Proportional to 11,784.37, 17,665.62 and 3,987.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,784.37 : 17,665.62 = 3,987.72 : x
2. Step 2: Convert to fraction form
   11,784.37/17,665.62 = 3,987.72/x
3. Step 3: Cross multiply
   11,784.37x = 17,665.62 × 3,987.72
4. Step 4: Simplify right side
   11,784.37x = 70,445,546.19
5. Step 5: Solve for x
   x = 70,445,546.19/11,784.37
6. Step 6: Final answer
   x = 5,977.88