Finding the Fourth Proportional to 43,789.10, 59,991.28 and 42,149.09

Step by Step Solution

1. Step 1: Write the proportion equation
   43,789.10 : 59,991.28 = 42,149.09 : x
2. Step 2: Convert to fraction form
   43,789.10/59,991.28 = 42,149.09/x
3. Step 3: Cross multiply
   43,789.10x = 59,991.28 × 42,149.09
4. Step 4: Simplify right side
   43,789.10x = 2,528,577,904.54
5. Step 5: Solve for x
   x = 2,528,577,904.54/43,789.10
6. Step 6: Final answer
   x = 57,744.47