Finding the Fourth Proportional to 1,346.78, 2,019.72 and 1,247.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,346.78 : 2,019.72 = 1,247.96 : x
2. Step 2: Convert to fraction form
   1,346.78/2,019.72 = 1,247.96/x
3. Step 3: Cross multiply
   1,346.78x = 2,019.72 × 1,247.96
4. Step 4: Simplify right side
   1,346.78x = 2,520,529.77
5. Step 5: Solve for x
   x = 2,520,529.77/1,346.78
6. Step 6: Final answer
   x = 1,871.52