Finding the Fourth Proportional to 1,591.89, 2,388.24 and 899.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.89 : 2,388.24 = 899.05 : x
2. Step 2: Convert to fraction form
   1,591.89/2,388.24 = 899.05/x
3. Step 3: Cross multiply
   1,591.89x = 2,388.24 × 899.05
4. Step 4: Simplify right side
   1,591.89x = 2,147,130.74
5. Step 5: Solve for x
   x = 2,147,130.74/1,591.89
6. Step 6: Final answer
   x = 1,348.80