Finding the Fourth Proportional to 30,967.85, 42,721.83 and 18,385.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,967.85 : 42,721.83 = 18,385.31 : x
2. Step 2: Convert to fraction form
   30,967.85/42,721.83 = 18,385.31/x
3. Step 3: Cross multiply
   30,967.85x = 42,721.83 × 18,385.31
4. Step 4: Simplify right side
   30,967.85x = 785,454,195.12
5. Step 5: Solve for x
   x = 785,454,195.12/30,967.85
6. Step 6: Final answer
   x = 25,363.53