Finding the Fourth Proportional to 1,435.77, 1,981.79 and 931.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.77 : 1,981.79 = 931.61 : x
2. Step 2: Convert to fraction form
   1,435.77/1,981.79 = 931.61/x
3. Step 3: Cross multiply
   1,435.77x = 1,981.79 × 931.61
4. Step 4: Simplify right side
   1,435.77x = 1,846,240.81
5. Step 5: Solve for x
   x = 1,846,240.81/1,435.77
6. Step 6: Final answer
   x = 1,285.89