Finding the Fourth Proportional to 1,967.76, 2,715.36 and 1,128.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,967.76 : 2,715.36 = 1,128.42 : x
2. Step 2: Convert to fraction form
   1,967.76/2,715.36 = 1,128.42/x
3. Step 3: Cross multiply
   1,967.76x = 2,715.36 × 1,128.42
4. Step 4: Simplify right side
   1,967.76x = 3,064,066.53
5. Step 5: Solve for x
   x = 3,064,066.53/1,967.76
6. Step 6: Final answer
   x = 1,557.13