Finding the Fourth Proportional to 3,606.72, 5,409.72 and 1,298.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,606.72 : 5,409.72 = 1,298.40 : x
2. Step 2: Convert to fraction form
   3,606.72/5,409.72 = 1,298.40/x
3. Step 3: Cross multiply
   3,606.72x = 5,409.72 × 1,298.40
4. Step 4: Simplify right side
   3,606.72x = 7,023,980.45
5. Step 5: Solve for x
   x = 7,023,980.45/3,606.72
6. Step 6: Final answer
   x = 1,947.47