Finding the Fourth Proportional to 51,002.78, 76,516.47 and 17,718

Step by Step Solution

1. Step 1: Write the proportion equation
   51,002.78 : 76,516.47 = 17,718 : x
2. Step 2: Convert to fraction form
   51,002.78/76,516.47 = 17,718/x
3. Step 3: Cross multiply
   51,002.78x = 76,516.47 × 17,718
4. Step 4: Simplify right side
   51,002.78x = 1,355,718,815.46
5. Step 5: Solve for x
   x = 1,355,718,815.46/51,002.78
6. Step 6: Final answer
   x = 26,581.28