Finding the Fourth Proportional to 3,139.98, 4,707.27 and 1,289.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.98 : 4,707.27 = 1,289.94 : x
2. Step 2: Convert to fraction form
   3,139.98/4,707.27 = 1,289.94/x
3. Step 3: Cross multiply
   3,139.98x = 4,707.27 × 1,289.94
4. Step 4: Simplify right side
   3,139.98x = 6,072,095.86
5. Step 5: Solve for x
   x = 6,072,095.86/3,139.98
6. Step 6: Final answer
   x = 1,933.80