Finding the Fourth Proportional to 31,342.79, 43,228.91 and 21,782.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,342.79 : 43,228.91 = 21,782.56 : x
2. Step 2: Convert to fraction form
   31,342.79/43,228.91 = 21,782.56/x
3. Step 3: Cross multiply
   31,342.79x = 43,228.91 × 21,782.56
4. Step 4: Simplify right side
   31,342.79x = 941,636,216.90
5. Step 5: Solve for x
   x = 941,636,216.90/31,342.79
6. Step 6: Final answer
   x = 30,043.16