Finding the Fourth Proportional to 1,379.53, 1,902.40 and 881.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.53 : 1,902.40 = 881.99 : x
2. Step 2: Convert to fraction form
   1,379.53/1,902.40 = 881.99/x
3. Step 3: Cross multiply
   1,379.53x = 1,902.40 × 881.99
4. Step 4: Simplify right side
   1,379.53x = 1,677,898.15
5. Step 5: Solve for x
   x = 1,677,898.15/1,379.53
6. Step 6: Final answer
   x = 1,216.28