Finding the Fourth Proportional to 31,420.45, 43,342.91 and 19,914.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,420.45 : 43,342.91 = 19,914.31 : x
2. Step 2: Convert to fraction form
   31,420.45/43,342.91 = 19,914.31/x
3. Step 3: Cross multiply
   31,420.45x = 43,342.91 × 19,914.31
4. Step 4: Simplify right side
   31,420.45x = 863,144,146.04
5. Step 5: Solve for x
   x = 863,144,146.04/31,420.45
6. Step 6: Final answer
   x = 27,470.78