Finding the Fourth Proportional to 1,615.55, 2,229.30 and 907.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.55 : 2,229.30 = 907.23 : x
2. Step 2: Convert to fraction form
   1,615.55/2,229.30 = 907.23/x
3. Step 3: Cross multiply
   1,615.55x = 2,229.30 × 907.23
4. Step 4: Simplify right side
   1,615.55x = 2,022,499.03
5. Step 5: Solve for x
   x = 2,022,499.03/1,615.55
6. Step 6: Final answer
   x = 1,251.89