Finding the Fourth Proportional to 1,128.06, 1,679.51 and 1,111.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.06 : 1,679.51 = 1,111.86 : x
2. Step 2: Convert to fraction form
   1,128.06/1,679.51 = 1,111.86/x
3. Step 3: Cross multiply
   1,128.06x = 1,679.51 × 1,111.86
4. Step 4: Simplify right side
   1,128.06x = 1,867,379.99
5. Step 5: Solve for x
   x = 1,867,379.99/1,128.06
6. Step 6: Final answer
   x = 1,655.39