Finding the Fourth Proportional to 33,385.74, 50,128.72 and 31,780.72

Step by Step Solution

1. Step 1: Write the proportion equation
   33,385.74 : 50,128.72 = 31,780.72 : x
2. Step 2: Convert to fraction form
   33,385.74/50,128.72 = 31,780.72/x
3. Step 3: Cross multiply
   33,385.74x = 50,128.72 × 31,780.72
4. Step 4: Simplify right side
   33,385.74x = 1,593,126,814.28
5. Step 5: Solve for x
   x = 1,593,126,814.28/33,385.74
6. Step 6: Final answer
   x = 47,718.78