Finding the Fourth Proportional to 1,380.74, 1,901.34 and 1,350.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.74 : 1,901.34 = 1,350.09 : x
2. Step 2: Convert to fraction form
   1,380.74/1,901.34 = 1,350.09/x
3. Step 3: Cross multiply
   1,380.74x = 1,901.34 × 1,350.09
4. Step 4: Simplify right side
   1,380.74x = 2,566,980.12
5. Step 5: Solve for x
   x = 2,566,980.12/1,380.74
6. Step 6: Final answer
   x = 1,859.14