Finding the Fourth Proportional to 30,583.06, 42,139.91 and 28,479.29

Step by Step Solution

1. Step 1: Write the proportion equation
   30,583.06 : 42,139.91 = 28,479.29 : x
2. Step 2: Convert to fraction form
   30,583.06/42,139.91 = 28,479.29/x
3. Step 3: Cross multiply
   30,583.06x = 42,139.91 × 28,479.29
4. Step 4: Simplify right side
   30,583.06x = 1,200,114,577.96
5. Step 5: Solve for x
   x = 1,200,114,577.96/30,583.06
6. Step 6: Final answer
   x = 39,241.16