Finding the Fourth Proportional to 1,003.86, 1,386.12 and 649.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.86 : 1,386.12 = 649.95 : x
2. Step 2: Convert to fraction form
   1,003.86/1,386.12 = 649.95/x
3. Step 3: Cross multiply
   1,003.86x = 1,386.12 × 649.95
4. Step 4: Simplify right side
   1,003.86x = 900,908.69
5. Step 5: Solve for x
   x = 900,908.69/1,003.86
6. Step 6: Final answer
   x = 897.44