Finding the Fourth Proportional to 31,153.39, 42,986.61 and 18,404.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,153.39 : 42,986.61 = 18,404.80 : x
2. Step 2: Convert to fraction form
   31,153.39/42,986.61 = 18,404.80/x
3. Step 3: Cross multiply
   31,153.39x = 42,986.61 × 18,404.80
4. Step 4: Simplify right side
   31,153.39x = 791,159,959.73
5. Step 5: Solve for x
   x = 791,159,959.73/31,153.39
6. Step 6: Final answer
   x = 25,395.63