Finding the Fourth Proportional to 1,564.89, 2,159.48 and 935.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,564.89 : 2,159.48 = 935.76 : x
2. Step 2: Convert to fraction form
   1,564.89/2,159.48 = 935.76/x
3. Step 3: Cross multiply
   1,564.89x = 2,159.48 × 935.76
4. Step 4: Simplify right side
   1,564.89x = 2,020,755.00
5. Step 5: Solve for x
   x = 2,020,755.00/1,564.89
6. Step 6: Final answer
   x = 1,291.31