Finding the Fourth Proportional to 47,981.78, 71,981.89 and 18,397.30

Step by Step Solution

1. Step 1: Write the proportion equation
   47,981.78 : 71,981.89 = 18,397.30 : x
2. Step 2: Convert to fraction form
   47,981.78/71,981.89 = 18,397.30/x
3. Step 3: Cross multiply
   47,981.78x = 71,981.89 × 18,397.30
4. Step 4: Simplify right side
   47,981.78x = 1,324,272,558.86
5. Step 5: Solve for x
   x = 1,324,272,558.86/47,981.78
6. Step 6: Final answer
   x = 27,599.49