Finding the Fourth Proportional to 1,406.72, 2,109.20 and 481.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.72 : 2,109.20 = 481.76 : x
2. Step 2: Convert to fraction form
   1,406.72/2,109.20 = 481.76/x
3. Step 3: Cross multiply
   1,406.72x = 2,109.20 × 481.76
4. Step 4: Simplify right side
   1,406.72x = 1,016,128.19
5. Step 5: Solve for x
   x = 1,016,128.19/1,406.72
6. Step 6: Final answer
   x = 722.34