Finding the Fourth Proportional to 1,385.04, 1,909.56 and 1,148.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.04 : 1,909.56 = 1,148.12 : x
2. Step 2: Convert to fraction form
   1,385.04/1,909.56 = 1,148.12/x
3. Step 3: Cross multiply
   1,385.04x = 1,909.56 × 1,148.12
4. Step 4: Simplify right side
   1,385.04x = 2,192,404.03
5. Step 5: Solve for x
   x = 2,192,404.03/1,385.04
6. Step 6: Final answer
   x = 1,582.92