Finding the Fourth Proportional to 1,379.88, 1,878.76 and 1,375.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.88 : 1,878.76 = 1,375.50 : x
2. Step 2: Convert to fraction form
   1,379.88/1,878.76 = 1,375.50/x
3. Step 3: Cross multiply
   1,379.88x = 1,878.76 × 1,375.50
4. Step 4: Simplify right side
   1,379.88x = 2,584,243.14
5. Step 5: Solve for x
   x = 2,584,243.14/1,379.88
6. Step 6: Final answer
   x = 1,872.80