Finding the Fourth Proportional to 3,914.05, 5,870.05 and 1,139.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,914.05 : 5,870.05 = 1,139.98 : x
2. Step 2: Convert to fraction form
   3,914.05/5,870.05 = 1,139.98/x
3. Step 3: Cross multiply
   3,914.05x = 5,870.05 × 1,139.98
4. Step 4: Simplify right side
   3,914.05x = 6,691,739.60
5. Step 5: Solve for x
   x = 6,691,739.60/3,914.05
6. Step 6: Final answer
   x = 1,709.67