Finding the Fourth Proportional to 42,341.57, 58,431.68 and 28,912.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,341.57 : 58,431.68 = 28,912.48 : x
2. Step 2: Convert to fraction form
   42,341.57/58,431.68 = 28,912.48/x
3. Step 3: Cross multiply
   42,341.57x = 58,431.68 × 28,912.48
4. Step 4: Simplify right side
   42,341.57x = 1,689,404,597.15
5. Step 5: Solve for x
   x = 1,689,404,597.15/42,341.57
6. Step 6: Final answer
   x = 39,899.43