Finding the Fourth Proportional to 1,375.12, 1,897.86 and 877.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.12 : 1,897.86 = 877.60 : x
2. Step 2: Convert to fraction form
   1,375.12/1,897.86 = 877.60/x
3. Step 3: Cross multiply
   1,375.12x = 1,897.86 × 877.60
4. Step 4: Simplify right side
   1,375.12x = 1,665,561.94
5. Step 5: Solve for x
   x = 1,665,561.94/1,375.12
6. Step 6: Final answer
   x = 1,211.21