Finding the Fourth Proportional to 1,178.50, 1,621.53 and 1,081.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178.50 : 1,621.53 = 1,081.30 : x
2. Step 2: Convert to fraction form
   1,178.50/1,621.53 = 1,081.30/x
3. Step 3: Cross multiply
   1,178.50x = 1,621.53 × 1,081.30
4. Step 4: Simplify right side
   1,178.50x = 1,753,356.34
5. Step 5: Solve for x
   x = 1,753,356.34/1,178.50
6. Step 6: Final answer
   x = 1,487.79