Finding the Fourth Proportional to 1,379.48, 1,902.92 and 881.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.48 : 1,902.92 = 881.55 : x
2. Step 2: Convert to fraction form
   1,379.48/1,902.92 = 881.55/x
3. Step 3: Cross multiply
   1,379.48x = 1,902.92 × 881.55
4. Step 4: Simplify right side
   1,379.48x = 1,677,514.72
5. Step 5: Solve for x
   x = 1,677,514.72/1,379.48
6. Step 6: Final answer
   x = 1,216.05