Finding the Fourth Proportional to 1,003.81, 1,385.37 and 561.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.81 : 1,385.37 = 561.82 : x
2. Step 2: Convert to fraction form
   1,003.81/1,385.37 = 561.82/x
3. Step 3: Cross multiply
   1,003.81x = 1,385.37 × 561.82
4. Step 4: Simplify right side
   1,003.81x = 778,328.57
5. Step 5: Solve for x
   x = 778,328.57/1,003.81
6. Step 6: Final answer
   x = 775.37