Finding the Fourth Proportional to 42,456.44, 58,615.48 and 28,128.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,456.44 : 58,615.48 = 28,128.40 : x
2. Step 2: Convert to fraction form
   42,456.44/58,615.48 = 28,128.40/x
3. Step 3: Cross multiply
   42,456.44x = 58,615.48 × 28,128.40
4. Step 4: Simplify right side
   42,456.44x = 1,648,759,374.55
5. Step 5: Solve for x
   x = 1,648,759,374.55/42,456.44
6. Step 6: Final answer
   x = 38,834.15