Finding the Fourth Proportional to 1,353.31, 2,018.42 and 1,178.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.31 : 2,018.42 = 1,178.55 : x
2. Step 2: Convert to fraction form
   1,353.31/2,018.42 = 1,178.55/x
3. Step 3: Cross multiply
   1,353.31x = 2,018.42 × 1,178.55
4. Step 4: Simplify right side
   1,353.31x = 2,378,807.42
5. Step 5: Solve for x
   x = 2,378,807.42/1,353.31
6. Step 6: Final answer
   x = 1,757.77