Finding the Fourth Proportional to 1,945.52, 2,686.72 and 1,238.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.52 : 2,686.72 = 1,238.70 : x
2. Step 2: Convert to fraction form
   1,945.52/2,686.72 = 1,238.70/x
3. Step 3: Cross multiply
   1,945.52x = 2,686.72 × 1,238.70
4. Step 4: Simplify right side
   1,945.52x = 3,328,040.06
5. Step 5: Solve for x
   x = 3,328,040.06/1,945.52
6. Step 6: Final answer
   x = 1,710.62