Finding the Fourth Proportional to 1,238.56, 1,709.46 and 1,047.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.56 : 1,709.46 = 1,047.88 : x
2. Step 2: Convert to fraction form
   1,238.56/1,709.46 = 1,047.88/x
3. Step 3: Cross multiply
   1,238.56x = 1,709.46 × 1,047.88
4. Step 4: Simplify right side
   1,238.56x = 1,791,308.94
5. Step 5: Solve for x
   x = 1,791,308.94/1,238.56
6. Step 6: Final answer
   x = 1,446.28