Finding the Fourth Proportional to 30,971.79, 42,727.32 and 18,389.25

Step by Step Solution

1. Step 1: Write the proportion equation
   30,971.79 : 42,727.32 = 18,389.25 : x
2. Step 2: Convert to fraction form
   30,971.79/42,727.32 = 18,389.25/x
3. Step 3: Cross multiply
   30,971.79x = 42,727.32 × 18,389.25
4. Step 4: Simplify right side
   30,971.79x = 785,723,369.31
5. Step 5: Solve for x
   x = 785,723,369.31/30,971.79
6. Step 6: Final answer
   x = 25,369.00