Finding the Fourth Proportional to 21,956.81, 32,870.60 and 13,610.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,956.81 : 32,870.60 = 13,610.03 : x
2. Step 2: Convert to fraction form
   21,956.81/32,870.60 = 13,610.03/x
3. Step 3: Cross multiply
   21,956.81x = 32,870.60 × 13,610.03
4. Step 4: Simplify right side
   21,956.81x = 447,369,619.71
5. Step 5: Solve for x
   x = 447,369,619.71/21,956.81
6. Step 6: Final answer
   x = 20,374.99