Finding the Fourth Proportional to 5,429.71, 8,145.60 and 1,870.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,429.71 : 8,145.60 = 1,870.89 : x
2. Step 2: Convert to fraction form
   5,429.71/8,145.60 = 1,870.89/x
3. Step 3: Cross multiply
   5,429.71x = 8,145.60 × 1,870.89
4. Step 4: Simplify right side
   5,429.71x = 15,239,476.18
5. Step 5: Solve for x
   x = 15,239,476.18/5,429.71
6. Step 6: Final answer
   x = 2,806.68