Finding the Fourth Proportional to 1,389.70, 1,918.54 and 941.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.70 : 1,918.54 = 941.88 : x
2. Step 2: Convert to fraction form
   1,389.70/1,918.54 = 941.88/x
3. Step 3: Cross multiply
   1,389.70x = 1,918.54 × 941.88
4. Step 4: Simplify right side
   1,389.70x = 1,807,034.46
5. Step 5: Solve for x
   x = 1,807,034.46/1,389.70
6. Step 6: Final answer
   x = 1,300.31