Finding the Fourth Proportional to 1,429.70, 1,973.31 and 931.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.70 : 1,973.31 = 931.47 : x
2. Step 2: Convert to fraction form
   1,429.70/1,973.31 = 931.47/x
3. Step 3: Cross multiply
   1,429.70x = 1,973.31 × 931.47
4. Step 4: Simplify right side
   1,429.70x = 1,838,079.07
5. Step 5: Solve for x
   x = 1,838,079.07/1,429.70
6. Step 6: Final answer
   x = 1,285.64