Finding the Fourth Proportional to 81,725.78, 112,780.81 and 45,426.28

Step by Step Solution

1. Step 1: Write the proportion equation
   81,725.78 : 112,780.81 = 45,426.28 : x
2. Step 2: Convert to fraction form
   81,725.78/112,780.81 = 45,426.28/x
3. Step 3: Cross multiply
   81,725.78x = 112,780.81 × 45,426.28
4. Step 4: Simplify right side
   81,725.78x = 5,123,212,626.28
5. Step 5: Solve for x
   x = 5,123,212,626.28/81,725.78
6. Step 6: Final answer
   x = 62,687.84