Finding the Fourth Proportional to 42,485.34, 58,632.64 and 28,120.43

Step by Step Solution

1. Step 1: Write the proportion equation
   42,485.34 : 58,632.64 = 28,120.43 : x
2. Step 2: Convert to fraction form
   42,485.34/58,632.64 = 28,120.43/x
3. Step 3: Cross multiply
   42,485.34x = 58,632.64 × 28,120.43
4. Step 4: Simplify right side
   42,485.34x = 1,648,775,048.84
5. Step 5: Solve for x
   x = 1,648,775,048.84/42,485.34
6. Step 6: Final answer
   x = 38,808.09