Finding the Fourth Proportional to 1,128.72, 1,555.69 and 930.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.72 : 1,555.69 = 930.14 : x
2. Step 2: Convert to fraction form
   1,128.72/1,555.69 = 930.14/x
3. Step 3: Cross multiply
   1,128.72x = 1,555.69 × 930.14
4. Step 4: Simplify right side
   1,128.72x = 1,447,009.50
5. Step 5: Solve for x
   x = 1,447,009.50/1,128.72
6. Step 6: Final answer
   x = 1,281.99