Finding the Fourth Proportional to 31,290.86, 43,146.78 and 19,942.38

Step by Step Solution

1. Step 1: Write the proportion equation
   31,290.86 : 43,146.78 = 19,942.38 : x
2. Step 2: Convert to fraction form
   31,290.86/43,146.78 = 19,942.38/x
3. Step 3: Cross multiply
   31,290.86x = 43,146.78 × 19,942.38
4. Step 4: Simplify right side
   31,290.86x = 860,449,482.54
5. Step 5: Solve for x
   x = 860,449,482.54/31,290.86
6. Step 6: Final answer
   x = 27,498.43