Finding the Fourth Proportional to 33,859.42, 50,761.42 and 12,787.50

Step by Step Solution

1. Step 1: Write the proportion equation
   33,859.42 : 50,761.42 = 12,787.50 : x
2. Step 2: Convert to fraction form
   33,859.42/50,761.42 = 12,787.50/x
3. Step 3: Cross multiply
   33,859.42x = 50,761.42 × 12,787.50
4. Step 4: Simplify right side
   33,859.42x = 649,111,816.64
5. Step 5: Solve for x
   x = 649,111,816.64/33,859.42
6. Step 6: Final answer
   x = 19,170.79