Finding the Fourth Proportional to 80,611.98, 120,915.90 and 21,448.15

Step by Step Solution

1. Step 1: Write the proportion equation
   80,611.98 : 120,915.90 = 21,448.15 : x
2. Step 2: Convert to fraction form
   80,611.98/120,915.90 = 21,448.15/x
3. Step 3: Cross multiply
   80,611.98x = 120,915.90 × 21,448.15
4. Step 4: Simplify right side
   80,611.98x = 2,593,422,360.59
5. Step 5: Solve for x
   x = 2,593,422,360.59/80,611.98
6. Step 6: Final answer
   x = 32,171.67