Finding the Fourth Proportional to 1,119.47, 1,543.98 and 721.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,119.47 : 1,543.98 = 721.17 : x
2. Step 2: Convert to fraction form
   1,119.47/1,543.98 = 721.17/x
3. Step 3: Cross multiply
   1,119.47x = 1,543.98 × 721.17
4. Step 4: Simplify right side
   1,119.47x = 1,113,464.34
5. Step 5: Solve for x
   x = 1,113,464.34/1,119.47
6. Step 6: Final answer
   x = 994.63