Finding the Fourth Proportional to 3,947.76, 5,920.35 and 1,314.70

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.76 : 5,920.35 = 1,314.70 : x
2. Step 2: Convert to fraction form
   3,947.76/5,920.35 = 1,314.70/x
3. Step 3: Cross multiply
   3,947.76x = 5,920.35 × 1,314.70
4. Step 4: Simplify right side
   3,947.76x = 7,783,484.15
5. Step 5: Solve for x
   x = 7,783,484.15/3,947.76
6. Step 6: Final answer
   x = 1,971.62