Finding the Fourth Proportional to 5,256.09, 7,889.60 and 3,870.99

Step by Step Solution

1. Step 1: Write the proportion equation
   5,256.09 : 7,889.60 = 3,870.99 : x
2. Step 2: Convert to fraction form
   5,256.09/7,889.60 = 3,870.99/x
3. Step 3: Cross multiply
   5,256.09x = 7,889.60 × 3,870.99
4. Step 4: Simplify right side
   5,256.09x = 30,540,572.38
5. Step 5: Solve for x
   x = 30,540,572.38/5,256.09
6. Step 6: Final answer
   x = 5,810.51