Finding the Fourth Proportional to 57,870.42, 86,811.99 and 18,418.29

Step by Step Solution

1. Step 1: Write the proportion equation
   57,870.42 : 86,811.99 = 18,418.29 : x
2. Step 2: Convert to fraction form
   57,870.42/86,811.99 = 18,418.29/x
3. Step 3: Cross multiply
   57,870.42x = 86,811.99 × 18,418.29
4. Step 4: Simplify right side
   57,870.42x = 1,598,928,407.30
5. Step 5: Solve for x
   x = 1,598,928,407.30/57,870.42
6. Step 6: Final answer
   x = 27,629.46