Finding the Fourth Proportional to 31,001.58, 42,782.31 and 18,426.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,001.58 : 42,782.31 = 18,426.42 : x
2. Step 2: Convert to fraction form
   31,001.58/42,782.31 = 18,426.42/x
3. Step 3: Cross multiply
   31,001.58x = 42,782.31 × 18,426.42
4. Step 4: Simplify right side
   31,001.58x = 788,324,812.63
5. Step 5: Solve for x
   x = 788,324,812.63/31,001.58
6. Step 6: Final answer
   x = 25,428.54