Finding the Fourth Proportional to 899.37, 1,238.22 and 765.72

Step by Step Solution

1. Step 1: Write the proportion equation
   899.37 : 1,238.22 = 765.72 : x
2. Step 2: Convert to fraction form
   899.37/1,238.22 = 765.72/x
3. Step 3: Cross multiply
   899.37x = 1,238.22 × 765.72
4. Step 4: Simplify right side
   899.37x = 948,129.82
5. Step 5: Solve for x
   x = 948,129.82/899.37
6. Step 6: Final answer
   x = 1,054.22