Finding the Fourth Proportional to 3,870.51, 5,806.37 and 1,272.84

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.51 : 5,806.37 = 1,272.84 : x
2. Step 2: Convert to fraction form
   3,870.51/5,806.37 = 1,272.84/x
3. Step 3: Cross multiply
   3,870.51x = 5,806.37 × 1,272.84
4. Step 4: Simplify right side
   3,870.51x = 7,390,579.99
5. Step 5: Solve for x
   x = 7,390,579.99/3,870.51
6. Step 6: Final answer
   x = 1,909.46