Finding the Fourth Proportional to 1,384.80, 1,910.28 and 1,147.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.80 : 1,910.28 = 1,147.42 : x
2. Step 2: Convert to fraction form
   1,384.80/1,910.28 = 1,147.42/x
3. Step 3: Cross multiply
   1,384.80x = 1,910.28 × 1,147.42
4. Step 4: Simplify right side
   1,384.80x = 2,191,883.93
5. Step 5: Solve for x
   x = 2,191,883.93/1,384.80
6. Step 6: Final answer
   x = 1,582.82