Finding the Fourth Proportional to 1,155.21, 1,594.71 and 899.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.21 : 1,594.71 = 899.12 : x
2. Step 2: Convert to fraction form
   1,155.21/1,594.71 = 899.12/x
3. Step 3: Cross multiply
   1,155.21x = 1,594.71 × 899.12
4. Step 4: Simplify right side
   1,155.21x = 1,433,835.66
5. Step 5: Solve for x
   x = 1,433,835.66/1,155.21
6. Step 6: Final answer
   x = 1,241.19