Finding the Fourth Proportional to 1,139.31, 1,710.18 and 925.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.31 : 1,710.18 = 925.47 : x
2. Step 2: Convert to fraction form
   1,139.31/1,710.18 = 925.47/x
3. Step 3: Cross multiply
   1,139.31x = 1,710.18 × 925.47
4. Step 4: Simplify right side
   1,139.31x = 1,582,720.28
5. Step 5: Solve for x
   x = 1,582,720.28/1,139.31
6. Step 6: Final answer
   x = 1,389.19