Finding the Fourth Proportional to 1,139.76, 1,580.67 and 1,068.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.76 : 1,580.67 = 1,068.48 : x
2. Step 2: Convert to fraction form
   1,139.76/1,580.67 = 1,068.48/x
3. Step 3: Cross multiply
   1,139.76x = 1,580.67 × 1,068.48
4. Step 4: Simplify right side
   1,139.76x = 1,688,914.28
5. Step 5: Solve for x
   x = 1,688,914.28/1,139.76
6. Step 6: Final answer
   x = 1,481.82