Finding the Fourth Proportional to 1,380.60, 1,907.96 and 1,131.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.60 : 1,907.96 = 1,131.52 : x
2. Step 2: Convert to fraction form
   1,380.60/1,907.96 = 1,131.52/x
3. Step 3: Cross multiply
   1,380.60x = 1,907.96 × 1,131.52
4. Step 4: Simplify right side
   1,380.60x = 2,158,894.90
5. Step 5: Solve for x
   x = 2,158,894.90/1,380.60
6. Step 6: Final answer
   x = 1,563.74