Finding the Fourth Proportional to 42,438.21, 58,613.94 and 28,266.45

Step by Step Solution

1. Step 1: Write the proportion equation
   42,438.21 : 58,613.94 = 28,266.45 : x
2. Step 2: Convert to fraction form
   42,438.21/58,613.94 = 28,266.45/x
3. Step 3: Cross multiply
   42,438.21x = 58,613.94 × 28,266.45
4. Step 4: Simplify right side
   42,438.21x = 1,656,808,004.31
5. Step 5: Solve for x
   x = 1,656,808,004.31/42,438.21
6. Step 6: Final answer
   x = 39,040.48