Finding the Fourth Proportional to 39,789.86, 54,881.87 and 33,780.15

Step by Step Solution

1. Step 1: Write the proportion equation
   39,789.86 : 54,881.87 = 33,780.15 : x
2. Step 2: Convert to fraction form
   39,789.86/54,881.87 = 33,780.15/x
3. Step 3: Cross multiply
   39,789.86x = 54,881.87 × 33,780.15
4. Step 4: Simplify right side
   39,789.86x = 1,853,917,631.98
5. Step 5: Solve for x
   x = 1,853,917,631.98/39,789.86
6. Step 6: Final answer
   x = 46,592.72