Finding the Fourth Proportional to 1,139.72, 1,710.06 and 729.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.72 : 1,710.06 = 729.32 : x
2. Step 2: Convert to fraction form
   1,139.72/1,710.06 = 729.32/x
3. Step 3: Cross multiply
   1,139.72x = 1,710.06 × 729.32
4. Step 4: Simplify right side
   1,139.72x = 1,247,180.96
5. Step 5: Solve for x
   x = 1,247,180.96/1,139.72
6. Step 6: Final answer
   x = 1,094.29