Finding the Fourth Proportional to 1,111.40, 1,664.56 and 953.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.40 : 1,664.56 = 953.45 : x
2. Step 2: Convert to fraction form
   1,111.40/1,664.56 = 953.45/x
3. Step 3: Cross multiply
   1,111.40x = 1,664.56 × 953.45
4. Step 4: Simplify right side
   1,111.40x = 1,587,074.73
5. Step 5: Solve for x
   x = 1,587,074.73/1,111.40
6. Step 6: Final answer
   x = 1,428.00