Finding the Fourth Proportional to 1,381.93, 1,907.72 and 884.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.93 : 1,907.72 = 884.86 : x
2. Step 2: Convert to fraction form
   1,381.93/1,907.72 = 884.86/x
3. Step 3: Cross multiply
   1,381.93x = 1,907.72 × 884.86
4. Step 4: Simplify right side
   1,381.93x = 1,688,059.24
5. Step 5: Solve for x
   x = 1,688,059.24/1,381.93
6. Step 6: Final answer
   x = 1,221.52