Finding the Fourth Proportional to 1,384.64, 2,078.56 and 948.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.64 : 2,078.56 = 948.72 : x
2. Step 2: Convert to fraction form
   1,384.64/2,078.56 = 948.72/x
3. Step 3: Cross multiply
   1,384.64x = 2,078.56 × 948.72
4. Step 4: Simplify right side
   1,384.64x = 1,971,971.44
5. Step 5: Solve for x
   x = 1,971,971.44/1,384.64
6. Step 6: Final answer
   x = 1,424.18