Finding the Fourth Proportional to 1,406.69, 2,104.86 and 877.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.69 : 2,104.86 = 877.76 : x
2. Step 2: Convert to fraction form
   1,406.69/2,104.86 = 877.76/x
3. Step 3: Cross multiply
   1,406.69x = 2,104.86 × 877.76
4. Step 4: Simplify right side
   1,406.69x = 1,847,561.91
5. Step 5: Solve for x
   x = 1,847,561.91/1,406.69
6. Step 6: Final answer
   x = 1,313.41