Finding the Fourth Proportional to 1,093.16, 1,508.72 and 621.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,093.16 : 1,508.72 = 621.08 : x
2. Step 2: Convert to fraction form
   1,093.16/1,508.72 = 621.08/x
3. Step 3: Cross multiply
   1,093.16x = 1,508.72 × 621.08
4. Step 4: Simplify right side
   1,093.16x = 937,035.82
5. Step 5: Solve for x
   x = 937,035.82/1,093.16
6. Step 6: Final answer
   x = 857.18