Finding the Fourth Proportional to 31,153.14, 42,986.27 and 18,404.55

Step by Step Solution

1. Step 1: Write the proportion equation
   31,153.14 : 42,986.27 = 18,404.55 : x
2. Step 2: Convert to fraction form
   31,153.14/42,986.27 = 18,404.55/x
3. Step 3: Cross multiply
   31,153.14x = 42,986.27 × 18,404.55
4. Step 4: Simplify right side
   31,153.14x = 791,142,863.51
5. Step 5: Solve for x
   x = 791,142,863.51/31,153.14
6. Step 6: Final answer
   x = 25,395.28