Finding the Fourth Proportional to 42,485.10, 58,632.29 and 28,120.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42,485.10 : 58,632.29 = 28,120.18 : x
2. Step 2: Convert to fraction form
   42,485.10/58,632.29 = 28,120.18/x
3. Step 3: Cross multiply
   42,485.10x = 58,632.29 × 28,120.18
4. Step 4: Simplify right side
   42,485.10x = 1,648,750,255.45
5. Step 5: Solve for x
   x = 1,648,750,255.45/42,485.10
6. Step 6: Final answer
   x = 38,807.73