Finding the Fourth Proportional to 1,081.08, 1,492.38 and 638.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.08 : 1,492.38 = 638.82 : x
2. Step 2: Convert to fraction form
   1,081.08/1,492.38 = 638.82/x
3. Step 3: Cross multiply
   1,081.08x = 1,492.38 × 638.82
4. Step 4: Simplify right side
   1,081.08x = 953,362.19
5. Step 5: Solve for x
   x = 953,362.19/1,081.08
6. Step 6: Final answer
   x = 881.86