Finding the Fourth Proportional to 1,120.71, 1,681.52 and 503.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.71 : 1,681.52 = 503.98 : x
2. Step 2: Convert to fraction form
   1,120.71/1,681.52 = 503.98/x
3. Step 3: Cross multiply
   1,120.71x = 1,681.52 × 503.98
4. Step 4: Simplify right side
   1,120.71x = 847,452.45
5. Step 5: Solve for x
   x = 847,452.45/1,120.71
6. Step 6: Final answer
   x = 756.17