Finding the Fourth Proportional to 2,111.76, 2,913.12 and 1,272

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.76 : 2,913.12 = 1,272 : x
2. Step 2: Convert to fraction form
   2,111.76/2,913.12 = 1,272/x
3. Step 3: Cross multiply
   2,111.76x = 2,913.12 × 1,272
4. Step 4: Simplify right side
   2,111.76x = 3,705,488.64
5. Step 5: Solve for x
   x = 3,705,488.64/2,111.76
6. Step 6: Final answer
   x = 1,754.69