Finding the Fourth Proportional to 8,705.78, 13,061.86 and 3,778.95

Step by Step Solution

1. Step 1: Write the proportion equation
   8,705.78 : 13,061.86 = 3,778.95 : x
2. Step 2: Convert to fraction form
   8,705.78/13,061.86 = 3,778.95/x
3. Step 3: Cross multiply
   8,705.78x = 13,061.86 × 3,778.95
4. Step 4: Simplify right side
   8,705.78x = 49,360,155.38
5. Step 5: Solve for x
   x = 49,360,155.38/8,705.78
6. Step 6: Final answer
   x = 5,669.82