Finding the Fourth Proportional to 81,721.42, 112,807.38 and 51,500.82

Step by Step Solution

1. Step 1: Write the proportion equation
   81,721.42 : 112,807.38 = 51,500.82 : x
2. Step 2: Convert to fraction form
   81,721.42/112,807.38 = 51,500.82/x
3. Step 3: Cross multiply
   81,721.42x = 112,807.38 × 51,500.82
4. Step 4: Simplify right side
   81,721.42x = 5,809,672,572.05
5. Step 5: Solve for x
   x = 5,809,672,572.05/81,721.42
6. Step 6: Final answer
   x = 71,091.18