Finding the Fourth Proportional to 1,311.08, 1,957.72 and 1,155.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.08 : 1,957.72 = 1,155.76 : x
2. Step 2: Convert to fraction form
   1,311.08/1,957.72 = 1,155.76/x
3. Step 3: Cross multiply
   1,311.08x = 1,957.72 × 1,155.76
4. Step 4: Simplify right side
   1,311.08x = 2,262,654.47
5. Step 5: Solve for x
   x = 2,262,654.47/1,311.08
6. Step 6: Final answer
   x = 1,725.79