Finding the Fourth Proportional to 1,077.56, 1,488.36 and 953.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.56 : 1,488.36 = 953.60 : x
2. Step 2: Convert to fraction form
   1,077.56/1,488.36 = 953.60/x
3. Step 3: Cross multiply
   1,077.56x = 1,488.36 × 953.60
4. Step 4: Simplify right side
   1,077.56x = 1,419,300.10
5. Step 5: Solve for x
   x = 1,419,300.10/1,077.56
6. Step 6: Final answer
   x = 1,317.14