Finding the Fourth Proportional to 3,889.76, 5,835.60 and 1,292.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,889.76 : 5,835.60 = 1,292.72 : x
2. Step 2: Convert to fraction form
   3,889.76/5,835.60 = 1,292.72/x
3. Step 3: Cross multiply
   3,889.76x = 5,835.60 × 1,292.72
4. Step 4: Simplify right side
   3,889.76x = 7,543,796.83
5. Step 5: Solve for x
   x = 7,543,796.83/3,889.76
6. Step 6: Final answer
   x = 1,939.40