Finding the Fourth Proportional to 1,005.06, 1,384.80 and 937.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005.06 : 1,384.80 = 937.31 : x
2. Step 2: Convert to fraction form
   1,005.06/1,384.80 = 937.31/x
3. Step 3: Cross multiply
   1,005.06x = 1,384.80 × 937.31
4. Step 4: Simplify right side
   1,005.06x = 1,297,986.89
5. Step 5: Solve for x
   x = 1,297,986.89/1,005.06
6. Step 6: Final answer
   x = 1,291.45