Finding the Fourth Proportional to 1,564.38, 2,158.34 and 935.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,564.38 : 2,158.34 = 935.01 : x
2. Step 2: Convert to fraction form
   1,564.38/2,158.34 = 935.01/x
3. Step 3: Cross multiply
   1,564.38x = 2,158.34 × 935.01
4. Step 4: Simplify right side
   1,564.38x = 2,018,064.81
5. Step 5: Solve for x
   x = 2,018,064.81/1,564.38
6. Step 6: Final answer
   x = 1,290.01