Finding the Fourth Proportional to 1,403.81, 1,938.17 and 880.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.81 : 1,938.17 = 880.76 : x
2. Step 2: Convert to fraction form
   1,403.81/1,938.17 = 880.76/x
3. Step 3: Cross multiply
   1,403.81x = 1,938.17 × 880.76
4. Step 4: Simplify right side
   1,403.81x = 1,707,055.12
5. Step 5: Solve for x
   x = 1,707,055.12/1,403.81
6. Step 6: Final answer
   x = 1,216.01