Finding the Fourth Proportional to 1,377.72, 1,900.87 and 1,308.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.72 : 1,900.87 = 1,308.47 : x
2. Step 2: Convert to fraction form
   1,377.72/1,900.87 = 1,308.47/x
3. Step 3: Cross multiply
   1,377.72x = 1,900.87 × 1,308.47
4. Step 4: Simplify right side
   1,377.72x = 2,487,218.59
5. Step 5: Solve for x
   x = 2,487,218.59/1,377.72
6. Step 6: Final answer
   x = 1,805.32