Finding the Fourth Proportional to 1,314.72, 1,971.99 and 1,238.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,314.72 : 1,971.99 = 1,238.58 : x
2. Step 2: Convert to fraction form
   1,314.72/1,971.99 = 1,238.58/x
3. Step 3: Cross multiply
   1,314.72x = 1,971.99 × 1,238.58
4. Step 4: Simplify right side
   1,314.72x = 2,442,467.37
5. Step 5: Solve for x
   x = 2,442,467.37/1,314.72
6. Step 6: Final answer
   x = 1,857.79