Finding the Fourth Proportional to 1,005.33, 1,387.39 and 612.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005.33 : 1,387.39 = 612.07 : x
2. Step 2: Convert to fraction form
   1,005.33/1,387.39 = 612.07/x
3. Step 3: Cross multiply
   1,005.33x = 1,387.39 × 612.07
4. Step 4: Simplify right side
   1,005.33x = 849,179.80
5. Step 5: Solve for x
   x = 849,179.80/1,005.33
6. Step 6: Final answer
   x = 844.68