Finding the Fourth Proportional to 1,389.24, 1,918.17 and 1,111.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.24 : 1,918.17 = 1,111.01 : x
2. Step 2: Convert to fraction form
   1,389.24/1,918.17 = 1,111.01/x
3. Step 3: Cross multiply
   1,389.24x = 1,918.17 × 1,111.01
4. Step 4: Simplify right side
   1,389.24x = 2,131,096.46
5. Step 5: Solve for x
   x = 2,131,096.46/1,389.24
6. Step 6: Final answer
   x = 1,534.00