Finding the Fourth Proportional to 1,128.86, 1,684.23 and 1,012.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.86 : 1,684.23 = 1,012.22 : x
2. Step 2: Convert to fraction form
   1,128.86/1,684.23 = 1,012.22/x
3. Step 3: Cross multiply
   1,128.86x = 1,684.23 × 1,012.22
4. Step 4: Simplify right side
   1,128.86x = 1,704,806.23
5. Step 5: Solve for x
   x = 1,704,806.23/1,128.86
6. Step 6: Final answer
   x = 1,510.20