Finding the Fourth Proportional to 1,384.04, 1,908.18 and 1,147.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.04 : 1,908.18 = 1,147.12 : x
2. Step 2: Convert to fraction form
   1,384.04/1,908.18 = 1,147.12/x
3. Step 3: Cross multiply
   1,384.04x = 1,908.18 × 1,147.12
4. Step 4: Simplify right side
   1,384.04x = 2,188,911.44
5. Step 5: Solve for x
   x = 2,188,911.44/1,384.04
6. Step 6: Final answer
   x = 1,581.54