Finding the Fourth Proportional to 81,666.18, 112,698.78 and 51,471

Step by Step Solution

1. Step 1: Write the proportion equation
   81,666.18 : 112,698.78 = 51,471 : x
2. Step 2: Convert to fraction form
   81,666.18/112,698.78 = 51,471/x
3. Step 3: Cross multiply
   81,666.18x = 112,698.78 × 51,471
4. Step 4: Simplify right side
   81,666.18x = 5,800,718,905.38
5. Step 5: Solve for x
   x = 5,800,718,905.38/81,666.18
6. Step 6: Final answer
   x = 71,029.63