Finding the Fourth Proportional to 1,402.86, 1,936.40 and 931.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.86 : 1,936.40 = 931.17 : x
2. Step 2: Convert to fraction form
   1,402.86/1,936.40 = 931.17/x
3. Step 3: Cross multiply
   1,402.86x = 1,936.40 × 931.17
4. Step 4: Simplify right side
   1,402.86x = 1,803,112.93
5. Step 5: Solve for x
   x = 1,803,112.93/1,402.86
6. Step 6: Final answer
   x = 1,285.31