Finding the Fourth Proportional to 1,485.40, 2,050.50 and 1,131.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.40 : 2,050.50 = 1,131.38 : x
2. Step 2: Convert to fraction form
   1,485.40/2,050.50 = 1,131.38/x
3. Step 3: Cross multiply
   1,485.40x = 2,050.50 × 1,131.38
4. Step 4: Simplify right side
   1,485.40x = 2,319,894.69
5. Step 5: Solve for x
   x = 2,319,894.69/1,485.40
6. Step 6: Final answer
   x = 1,561.80