Finding the Fourth Proportional to 1,003.55, 1,384.83 and 561.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.55 : 1,384.83 = 561.47 : x
2. Step 2: Convert to fraction form
   1,003.55/1,384.83 = 561.47/x
3. Step 3: Cross multiply
   1,003.55x = 1,384.83 × 561.47
4. Step 4: Simplify right side
   1,003.55x = 777,533.58
5. Step 5: Solve for x
   x = 777,533.58/1,003.55
6. Step 6: Final answer
   x = 774.79