Finding the Fourth Proportional to 1,377.90, 1,902.29 and 1,045.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.90 : 1,902.29 = 1,045.74 : x
2. Step 2: Convert to fraction form
   1,377.90/1,902.29 = 1,045.74/x
3. Step 3: Cross multiply
   1,377.90x = 1,902.29 × 1,045.74
4. Step 4: Simplify right side
   1,377.90x = 1,989,300.74
5. Step 5: Solve for x
   x = 1,989,300.74/1,377.90
6. Step 6: Final answer
   x = 1,443.72