Finding the Fourth Proportional to 1,409.12, 1,944.16 and 877.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,409.12 : 1,944.16 = 877.72 : x
2. Step 2: Convert to fraction form
   1,409.12/1,944.16 = 877.72/x
3. Step 3: Cross multiply
   1,409.12x = 1,944.16 × 877.72
4. Step 4: Simplify right side
   1,409.12x = 1,706,428.12
5. Step 5: Solve for x
   x = 1,706,428.12/1,409.12
6. Step 6: Final answer
   x = 1,210.99