Finding the Fourth Proportional to 31,603.98, 43,607.78 and 20,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,603.98 : 43,607.78 = 20,419.50 : x
2. Step 2: Convert to fraction form
   31,603.98/43,607.78 = 20,419.50/x
3. Step 3: Cross multiply
   31,603.98x = 43,607.78 × 20,419.50
4. Step 4: Simplify right side
   31,603.98x = 890,449,063.71
5. Step 5: Solve for x
   x = 890,449,063.71/31,603.98
6. Step 6: Final answer
   x = 28,175.22