Finding the Fourth Proportional to 1,380.36, 1,903.32 and 1,130.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.36 : 1,903.32 = 1,130.88 : x
2. Step 2: Convert to fraction form
   1,380.36/1,903.32 = 1,130.88/x
3. Step 3: Cross multiply
   1,380.36x = 1,903.32 × 1,130.88
4. Step 4: Simplify right side
   1,380.36x = 2,152,426.52
5. Step 5: Solve for x
   x = 2,152,426.52/1,380.36
6. Step 6: Final answer
   x = 1,559.32