Finding the Fourth Proportional to 1,238.76, 1,708.56 and 925.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.76 : 1,708.56 = 925.12 : x
2. Step 2: Convert to fraction form
   1,238.76/1,708.56 = 925.12/x
3. Step 3: Cross multiply
   1,238.76x = 1,708.56 × 925.12
4. Step 4: Simplify right side
   1,238.76x = 1,580,623.03
5. Step 5: Solve for x
   x = 1,580,623.03/1,238.76
6. Step 6: Final answer
   x = 1,275.97