Finding the Fourth Proportional to 1,390.02, 1,917.57 and 948.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.02 : 1,917.57 = 948.54 : x
2. Step 2: Convert to fraction form
   1,390.02/1,917.57 = 948.54/x
3. Step 3: Cross multiply
   1,390.02x = 1,917.57 × 948.54
4. Step 4: Simplify right side
   1,390.02x = 1,818,891.85
5. Step 5: Solve for x
   x = 1,818,891.85/1,390.02
6. Step 6: Final answer
   x = 1,308.54