Finding the Fourth Proportional to 11,987.65, 17,989.98 and 4,196.53

Step by Step Solution

1. Step 1: Write the proportion equation
   11,987.65 : 17,989.98 = 4,196.53 : x
2. Step 2: Convert to fraction form
   11,987.65/17,989.98 = 4,196.53/x
3. Step 3: Cross multiply
   11,987.65x = 17,989.98 × 4,196.53
4. Step 4: Simplify right side
   11,987.65x = 75,495,490.77
5. Step 5: Solve for x
   x = 75,495,490.77/11,987.65
6. Step 6: Final answer
   x = 6,297.77