Finding the Fourth Proportional to 21,611.35, 32,343.72 and 13,296.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,611.35 : 32,343.72 = 13,296.61 : x
2. Step 2: Convert to fraction form
   21,611.35/32,343.72 = 13,296.61/x
3. Step 3: Cross multiply
   21,611.35x = 32,343.72 × 13,296.61
4. Step 4: Simplify right side
   21,611.35x = 430,061,830.79
5. Step 5: Solve for x
   x = 430,061,830.79/21,611.35
6. Step 6: Final answer
   x = 19,899.81