Finding the Fourth Proportional to 1,405.55, 1,939.34 and 881.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.55 : 1,939.34 = 881.69 : x
2. Step 2: Convert to fraction form
   1,405.55/1,939.34 = 881.69/x
3. Step 3: Cross multiply
   1,405.55x = 1,939.34 × 881.69
4. Step 4: Simplify right side
   1,405.55x = 1,709,889.19
5. Step 5: Solve for x
   x = 1,709,889.19/1,405.55
6. Step 6: Final answer
   x = 1,216.52