Finding the Fourth Proportional to 30,661.35, 42,295.32 and 19,311.32

Step by Step Solution

1. Step 1: Write the proportion equation
   30,661.35 : 42,295.32 = 19,311.32 : x
2. Step 2: Convert to fraction form
   30,661.35/42,295.32 = 19,311.32/x
3. Step 3: Cross multiply
   30,661.35x = 42,295.32 × 19,311.32
4. Step 4: Simplify right side
   30,661.35x = 816,778,247.55
5. Step 5: Solve for x
   x = 816,778,247.55/30,661.35
6. Step 6: Final answer
   x = 26,638.69