Finding the Fourth Proportional to 1,087.74, 1,505.04 and 948.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.74 : 1,505.04 = 948.15 : x
2. Step 2: Convert to fraction form
   1,087.74/1,505.04 = 948.15/x
3. Step 3: Cross multiply
   1,087.74x = 1,505.04 × 948.15
4. Step 4: Simplify right side
   1,087.74x = 1,427,003.68
5. Step 5: Solve for x
   x = 1,427,003.68/1,087.74
6. Step 6: Final answer
   x = 1,311.90