Finding the Fourth Proportional to 1,003.18, 1,384.35 and 561.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.18 : 1,384.35 = 561.07 : x
2. Step 2: Convert to fraction form
   1,003.18/1,384.35 = 561.07/x
3. Step 3: Cross multiply
   1,003.18x = 1,384.35 × 561.07
4. Step 4: Simplify right side
   1,003.18x = 776,717.25
5. Step 5: Solve for x
   x = 776,717.25/1,003.18
6. Step 6: Final answer
   x = 774.26