Finding the Fourth Proportional to 1,380.69, 1,901.73 and 1,373.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.69 : 1,901.73 = 1,373.40 : x
2. Step 2: Convert to fraction form
   1,380.69/1,901.73 = 1,373.40/x
3. Step 3: Cross multiply
   1,380.69x = 1,901.73 × 1,373.40
4. Step 4: Simplify right side
   1,380.69x = 2,611,835.98
5. Step 5: Solve for x
   x = 2,611,835.98/1,380.69
6. Step 6: Final answer
   x = 1,891.69