Finding the Fourth Proportional to 1,238.91, 1,849.87 and 1,056.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.91 : 1,849.87 = 1,056.21 : x
2. Step 2: Convert to fraction form
   1,238.91/1,849.87 = 1,056.21/x
3. Step 3: Cross multiply
   1,238.91x = 1,849.87 × 1,056.21
4. Step 4: Simplify right side
   1,238.91x = 1,953,848.55
5. Step 5: Solve for x
   x = 1,953,848.55/1,238.91
6. Step 6: Final answer
   x = 1,577.07