Finding the Fourth Proportional to 81,768.56, 112,836.90 and 47,780.15

Step by Step Solution

1. Step 1: Write the proportion equation
   81,768.56 : 112,836.90 = 47,780.15 : x
2. Step 2: Convert to fraction form
   81,768.56/112,836.90 = 47,780.15/x
3. Step 3: Cross multiply
   81,768.56x = 112,836.90 × 47,780.15
4. Step 4: Simplify right side
   81,768.56x = 5,391,363,443.35
5. Step 5: Solve for x
   x = 5,391,363,443.35/81,768.56
6. Step 6: Final answer
   x = 65,934.43