Finding the Fourth Proportional to 1,108.82, 1,530.32 and 921.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.82 : 1,530.32 = 921.99 : x
2. Step 2: Convert to fraction form
   1,108.82/1,530.32 = 921.99/x
3. Step 3: Cross multiply
   1,108.82x = 1,530.32 × 921.99
4. Step 4: Simplify right side
   1,108.82x = 1,410,939.15
5. Step 5: Solve for x
   x = 1,410,939.15/1,108.82
6. Step 6: Final answer
   x = 1,272.47