Finding the Fourth Proportional to 1,402.71, 1,936.56 and 931.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.71 : 1,936.56 = 931.25 : x
2. Step 2: Convert to fraction form
   1,402.71/1,936.56 = 931.25/x
3. Step 3: Cross multiply
   1,402.71x = 1,936.56 × 931.25
4. Step 4: Simplify right side
   1,402.71x = 1,803,411.82
5. Step 5: Solve for x
   x = 1,803,411.82/1,402.71
6. Step 6: Final answer
   x = 1,285.66