Finding the Fourth Proportional to 42,257.34, 58,323.78 and 28,865.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,257.34 : 58,323.78 = 28,865.61 : x
2. Step 2: Convert to fraction form
   42,257.34/58,323.78 = 28,865.61/x
3. Step 3: Cross multiply
   42,257.34x = 58,323.78 × 28,865.61
4. Step 4: Simplify right side
   42,257.34x = 1,683,551,487.21
5. Step 5: Solve for x
   x = 1,683,551,487.21/42,257.34
6. Step 6: Final answer
   x = 39,840.45