Finding the Fourth Proportional to 1,578.12, 2,177.82 and 948.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.12 : 2,177.82 = 948.72 : x
2. Step 2: Convert to fraction form
   1,578.12/2,177.82 = 948.72/x
3. Step 3: Cross multiply
   1,578.12x = 2,177.82 × 948.72
4. Step 4: Simplify right side
   1,578.12x = 2,066,141.39
5. Step 5: Solve for x
   x = 2,066,141.39/1,578.12
6. Step 6: Final answer
   x = 1,309.24