Finding the Fourth Proportional to 30,978.14, 42,753.48 and 18,402.89

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.14 : 42,753.48 = 18,402.89 : x
2. Step 2: Convert to fraction form
   30,978.14/42,753.48 = 18,402.89/x
3. Step 3: Cross multiply
   30,978.14x = 42,753.48 × 18,402.89
4. Step 4: Simplify right side
   30,978.14x = 786,787,650.78
5. Step 5: Solve for x
   x = 786,787,650.78/30,978.14
6. Step 6: Final answer
   x = 25,398.16