Finding the Fourth Proportional to 1,136.03, 1,567.69 and 638.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,136.03 : 1,567.69 = 638.62 : x
2. Step 2: Convert to fraction form
   1,136.03/1,567.69 = 638.62/x
3. Step 3: Cross multiply
   1,136.03x = 1,567.69 × 638.62
4. Step 4: Simplify right side
   1,136.03x = 1,001,152.67
5. Step 5: Solve for x
   x = 1,001,152.67/1,136.03
6. Step 6: Final answer
   x = 881.28