Finding the Fourth Proportional to 1,380.15, 1,903.53 and 907.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.15 : 1,903.53 = 907.53 : x
2. Step 2: Convert to fraction form
   1,380.15/1,903.53 = 907.53/x
3. Step 3: Cross multiply
   1,380.15x = 1,903.53 × 907.53
4. Step 4: Simplify right side
   1,380.15x = 1,727,510.58
5. Step 5: Solve for x
   x = 1,727,510.58/1,380.15
6. Step 6: Final answer
   x = 1,251.68