Finding the Fourth Proportional to 11,885.56, 17,830.52 and 3,987.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,885.56 : 17,830.52 = 3,987.28 : x
2. Step 2: Convert to fraction form
   11,885.56/17,830.52 = 3,987.28/x
3. Step 3: Cross multiply
   11,885.56x = 17,830.52 × 3,987.28
4. Step 4: Simplify right side
   11,885.56x = 71,095,275.79
5. Step 5: Solve for x
   x = 71,095,275.79/11,885.56
6. Step 6: Final answer
   x = 5,981.65