Finding the Fourth Proportional to 42,651.48, 58,918.56 and 40,409.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,651.48 : 58,918.56 = 40,409.40 : x
2. Step 2: Convert to fraction form
   42,651.48/58,918.56 = 40,409.40/x
3. Step 3: Cross multiply
   42,651.48x = 58,918.56 × 40,409.40
4. Step 4: Simplify right side
   42,651.48x = 2,380,863,658.46
5. Step 5: Solve for x
   x = 2,380,863,658.46/42,651.48
6. Step 6: Final answer
   x = 55,821.36