Finding the Fourth Proportional to 3,870.47, 5,805.78 and 948.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.47 : 5,805.78 = 948.80 : x
2. Step 2: Convert to fraction form
   3,870.47/5,805.78 = 948.80/x
3. Step 3: Cross multiply
   3,870.47x = 5,805.78 × 948.80
4. Step 4: Simplify right side
   3,870.47x = 5,508,524.06
5. Step 5: Solve for x
   x = 5,508,524.06/3,870.47
6. Step 6: Final answer
   x = 1,423.22