Finding the Fourth Proportional to 1,920.42, 2,881.58 and 879.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.42 : 2,881.58 = 879.93 : x
2. Step 2: Convert to fraction form
   1,920.42/2,881.58 = 879.93/x
3. Step 3: Cross multiply
   1,920.42x = 2,881.58 × 879.93
4. Step 4: Simplify right side
   1,920.42x = 2,535,588.69
5. Step 5: Solve for x
   x = 2,535,588.69/1,920.42
6. Step 6: Final answer
   x = 1,320.33