Finding the Fourth Proportional to 21,993.58, 32,985.32 and 13,111.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,993.58 : 32,985.32 = 13,111.42 : x
2. Step 2: Convert to fraction form
   21,993.58/32,985.32 = 13,111.42/x
3. Step 3: Cross multiply
   21,993.58x = 32,985.32 × 13,111.42
4. Step 4: Simplify right side
   21,993.58x = 432,484,427.83
5. Step 5: Solve for x
   x = 432,484,427.83/21,993.58
6. Step 6: Final answer
   x = 19,664.12