Finding the Fourth Proportional to 1,380.72, 1,903.36 and 1,362.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.72 : 1,903.36 = 1,362.16 : x
2. Step 2: Convert to fraction form
   1,380.72/1,903.36 = 1,362.16/x
3. Step 3: Cross multiply
   1,380.72x = 1,903.36 × 1,362.16
4. Step 4: Simplify right side
   1,380.72x = 2,592,680.86
5. Step 5: Solve for x
   x = 2,592,680.86/1,380.72
6. Step 6: Final answer
   x = 1,877.77