Finding the Fourth Proportional to 31,150.89, 42,983.16 and 18,402.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,150.89 : 42,983.16 = 18,402.30 : x
2. Step 2: Convert to fraction form
   31,150.89/42,983.16 = 18,402.30/x
3. Step 3: Cross multiply
   31,150.89x = 42,983.16 × 18,402.30
4. Step 4: Simplify right side
   31,150.89x = 790,989,005.27
5. Step 5: Solve for x
   x = 790,989,005.27/31,150.89
6. Step 6: Final answer
   x = 25,392.18