Finding the Fourth Proportional to 1,005.30, 1,386.45 and 946.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005.30 : 1,386.45 = 946.98 : x
2. Step 2: Convert to fraction form
   1,005.30/1,386.45 = 946.98/x
3. Step 3: Cross multiply
   1,005.30x = 1,386.45 × 946.98
4. Step 4: Simplify right side
   1,005.30x = 1,312,940.42
5. Step 5: Solve for x
   x = 1,312,940.42/1,005.30
6. Step 6: Final answer
   x = 1,306.02