Finding the Fourth Proportional to 1,403.89, 1,936.55 and 879.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.89 : 1,936.55 = 879.01 : x
2. Step 2: Convert to fraction form
   1,403.89/1,936.55 = 879.01/x
3. Step 3: Cross multiply
   1,403.89x = 1,936.55 × 879.01
4. Step 4: Simplify right side
   1,403.89x = 1,702,244.17
5. Step 5: Solve for x
   x = 1,702,244.17/1,403.89
6. Step 6: Final answer
   x = 1,212.52