Finding the Fourth Proportional to 1,139.91, 1,706.90 and 976.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.91 : 1,706.90 = 976.43 : x
2. Step 2: Convert to fraction form
   1,139.91/1,706.90 = 976.43/x
3. Step 3: Cross multiply
   1,139.91x = 1,706.90 × 976.43
4. Step 4: Simplify right side
   1,139.91x = 1,666,662.27
5. Step 5: Solve for x
   x = 1,666,662.27/1,139.91
6. Step 6: Final answer
   x = 1,462.10