Finding the Fourth Proportional to 1,003.49, 1,384.88 and 561.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.49 : 1,384.88 = 561.45 : x
2. Step 2: Convert to fraction form
   1,003.49/1,384.88 = 561.45/x
3. Step 3: Cross multiply
   1,003.49x = 1,384.88 × 561.45
4. Step 4: Simplify right side
   1,003.49x = 777,538.07
5. Step 5: Solve for x
   x = 777,538.07/1,003.49
6. Step 6: Final answer
   x = 774.84