Finding the Fourth Proportional to 3,905.86, 5,858.76 and 1,308.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,905.86 : 5,858.76 = 1,308.78 : x
2. Step 2: Convert to fraction form
   3,905.86/5,858.76 = 1,308.78/x
3. Step 3: Cross multiply
   3,905.86x = 5,858.76 × 1,308.78
4. Step 4: Simplify right side
   3,905.86x = 7,667,827.91
5. Step 5: Solve for x
   x = 7,667,827.91/3,905.86
6. Step 6: Final answer
   x = 1,963.16