Finding the Fourth Proportional to 81,520.81, 112,496.38 and 49,678.09

Step by Step Solution

1. Step 1: Write the proportion equation
   81,520.81 : 112,496.38 = 49,678.09 : x
2. Step 2: Convert to fraction form
   81,520.81/112,496.38 = 49,678.09/x
3. Step 3: Cross multiply
   81,520.81x = 112,496.38 × 49,678.09
4. Step 4: Simplify right side
   81,520.81x = 5,588,605,290.31
5. Step 5: Solve for x
   x = 5,588,605,290.31/81,520.81
6. Step 6: Final answer
   x = 68,554.34