Finding the Fourth Proportional to 31,490.91, 43,454.24 and 19,389.47

Step by Step Solution

1. Step 1: Write the proportion equation
   31,490.91 : 43,454.24 = 19,389.47 : x
2. Step 2: Convert to fraction form
   31,490.91/43,454.24 = 19,389.47/x
3. Step 3: Cross multiply
   31,490.91x = 43,454.24 × 19,389.47
4. Step 4: Simplify right side
   31,490.91x = 842,554,682.85
5. Step 5: Solve for x
   x = 842,554,682.85/31,490.91
6. Step 6: Final answer
   x = 26,755.49