Finding the Fourth Proportional to 4,870.50, 7,305.79 and 1,407.78

Step by Step Solution

1. Step 1: Write the proportion equation
   4,870.50 : 7,305.79 = 1,407.78 : x
2. Step 2: Convert to fraction form
   4,870.50/7,305.79 = 1,407.78/x
3. Step 3: Cross multiply
   4,870.50x = 7,305.79 × 1,407.78
4. Step 4: Simplify right side
   4,870.50x = 10,284,945.05
5. Step 5: Solve for x
   x = 10,284,945.05/4,870.50
6. Step 6: Final answer
   x = 2,111.68