Finding the Fourth Proportional to 31,288.86, 43,144.03 and 19,940.39

Step by Step Solution

1. Step 1: Write the proportion equation
   31,288.86 : 43,144.03 = 19,940.39 : x
2. Step 2: Convert to fraction form
   31,288.86/43,144.03 = 19,940.39/x
3. Step 3: Cross multiply
   31,288.86x = 43,144.03 × 19,940.39
4. Step 4: Simplify right side
   31,288.86x = 860,308,468.95
5. Step 5: Solve for x
   x = 860,308,468.95/31,288.86
6. Step 6: Final answer
   x = 27,495.68