Finding the Fourth Proportional to 1,387.99, 1,912.17 and 967.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.99 : 1,912.17 = 967.58 : x
2. Step 2: Convert to fraction form
   1,387.99/1,912.17 = 967.58/x
3. Step 3: Cross multiply
   1,387.99x = 1,912.17 × 967.58
4. Step 4: Simplify right side
   1,387.99x = 1,850,177.45
5. Step 5: Solve for x
   x = 1,850,177.45/1,387.99
6. Step 6: Final answer
   x = 1,332.99