Finding the Fourth Proportional to 1,406.64, 1,940.40 and 881.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.64 : 1,940.40 = 881.76 : x
2. Step 2: Convert to fraction form
   1,406.64/1,940.40 = 881.76/x
3. Step 3: Cross multiply
   1,406.64x = 1,940.40 × 881.76
4. Step 4: Simplify right side
   1,406.64x = 1,710,967.10
5. Step 5: Solve for x
   x = 1,710,967.10/1,406.64
6. Step 6: Final answer
   x = 1,216.35