Finding the Fourth Proportional to 3,931.25, 5,896.15 and 1,298.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.25 : 5,896.15 = 1,298.78 : x
2. Step 2: Convert to fraction form
   3,931.25/5,896.15 = 1,298.78/x
3. Step 3: Cross multiply
   3,931.25x = 5,896.15 × 1,298.78
4. Step 4: Simplify right side
   3,931.25x = 7,657,787.85
5. Step 5: Solve for x
   x = 7,657,787.85/3,931.25
6. Step 6: Final answer
   x = 1,947.93