Finding the Fourth Proportional to 30,815.37, 42,521.55 and 17,385.84

Step by Step Solution

1. Step 1: Write the proportion equation
   30,815.37 : 42,521.55 = 17,385.84 : x
2. Step 2: Convert to fraction form
   30,815.37/42,521.55 = 17,385.84/x
3. Step 3: Cross multiply
   30,815.37x = 42,521.55 × 17,385.84
4. Step 4: Simplify right side
   30,815.37x = 739,272,864.85
5. Step 5: Solve for x
   x = 739,272,864.85/30,815.37
6. Step 6: Final answer
   x = 23,990.39