Finding the Fourth Proportional to 1,429.84, 1,973.51 and 931.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.84 : 1,973.51 = 931.60 : x
2. Step 2: Convert to fraction form
   1,429.84/1,973.51 = 931.60/x
3. Step 3: Cross multiply
   1,429.84x = 1,973.51 × 931.60
4. Step 4: Simplify right side
   1,429.84x = 1,838,521.92
5. Step 5: Solve for x
   x = 1,838,521.92/1,429.84
6. Step 6: Final answer
   x = 1,285.82