Finding the Fourth Proportional to 1,003.48, 1,384.87 and 561.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.48 : 1,384.87 = 561.35 : x
2. Step 2: Convert to fraction form
   1,003.48/1,384.87 = 561.35/x
3. Step 3: Cross multiply
   1,003.48x = 1,384.87 × 561.35
4. Step 4: Simplify right side
   1,003.48x = 777,392.10
5. Step 5: Solve for x
   x = 777,392.10/1,003.48
6. Step 6: Final answer
   x = 774.70