Finding the Fourth Proportional to 1,967.81, 2,715.80 and 1,128.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,967.81 : 2,715.80 = 1,128.51 : x
2. Step 2: Convert to fraction form
   1,967.81/2,715.80 = 1,128.51/x
3. Step 3: Cross multiply
   1,967.81x = 2,715.80 × 1,128.51
4. Step 4: Simplify right side
   1,967.81x = 3,064,801.82
5. Step 5: Solve for x
   x = 3,064,801.82/1,967.81
6. Step 6: Final answer
   x = 1,557.47