Finding the Fourth Proportional to 3,905.42, 5,856.72 and 1,307.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,905.42 : 5,856.72 = 1,307.76 : x
2. Step 2: Convert to fraction form
   3,905.42/5,856.72 = 1,307.76/x
3. Step 3: Cross multiply
   3,905.42x = 5,856.72 × 1,307.76
4. Step 4: Simplify right side
   3,905.42x = 7,659,184.15
5. Step 5: Solve for x
   x = 7,659,184.15/3,905.42
6. Step 6: Final answer
   x = 1,961.17