Finding the Fourth Proportional to 1,346.40, 1,856.88 and 997.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,346.40 : 1,856.88 = 997.92 : x
2. Step 2: Convert to fraction form
   1,346.40/1,856.88 = 997.92/x
3. Step 3: Cross multiply
   1,346.40x = 1,856.88 × 997.92
4. Step 4: Simplify right side
   1,346.40x = 1,853,017.69
5. Step 5: Solve for x
   x = 1,853,017.69/1,346.40
6. Step 6: Final answer
   x = 1,376.28