Finding the Fourth Proportional to 1,109.90, 1,661.72 and 925.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.90 : 1,661.72 = 925.37 : x
2. Step 2: Convert to fraction form
   1,109.90/1,661.72 = 925.37/x
3. Step 3: Cross multiply
   1,109.90x = 1,661.72 × 925.37
4. Step 4: Simplify right side
   1,109.90x = 1,537,708.48
5. Step 5: Solve for x
   x = 1,537,708.48/1,109.90
6. Step 6: Final answer
   x = 1,385.44