Finding the Fourth Proportional to 21,596.54, 29,804.72 and 13,099.01

Step by Step Solution

1. Step 1: Write the proportion equation
   21,596.54 : 29,804.72 = 13,099.01 : x
2. Step 2: Convert to fraction form
   21,596.54/29,804.72 = 13,099.01/x
3. Step 3: Cross multiply
   21,596.54x = 29,804.72 × 13,099.01
4. Step 4: Simplify right side
   21,596.54x = 390,412,110.81
5. Step 5: Solve for x
   x = 390,412,110.81/21,596.54
6. Step 6: Final answer
   x = 18,077.53