Finding the Fourth Proportional to 1,564.89, 2,159.56 and 901.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,564.89 : 2,159.56 = 901.74 : x
2. Step 2: Convert to fraction form
   1,564.89/2,159.56 = 901.74/x
3. Step 3: Cross multiply
   1,564.89x = 2,159.56 × 901.74
4. Step 4: Simplify right side
   1,564.89x = 1,947,361.63
5. Step 5: Solve for x
   x = 1,947,361.63/1,564.89
6. Step 6: Final answer
   x = 1,244.41