Finding the Fourth Proportional to 2,081.76, 2,872.80 and 1,242.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.76 : 2,872.80 = 1,242.84 : x
2. Step 2: Convert to fraction form
   2,081.76/2,872.80 = 1,242.84/x
3. Step 3: Cross multiply
   2,081.76x = 2,872.80 × 1,242.84
4. Step 4: Simplify right side
   2,081.76x = 3,570,430.75
5. Step 5: Solve for x
   x = 3,570,430.75/2,081.76
6. Step 6: Final answer
   x = 1,715.10