Finding the Fourth Proportional to 1,317.62, 1,816.61 and 1,080.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.62 : 1,816.61 = 1,080.69 : x
2. Step 2: Convert to fraction form
   1,317.62/1,816.61 = 1,080.69/x
3. Step 3: Cross multiply
   1,317.62x = 1,816.61 × 1,080.69
4. Step 4: Simplify right side
   1,317.62x = 1,963,186.86
5. Step 5: Solve for x
   x = 1,963,186.86/1,317.62
6. Step 6: Final answer
   x = 1,489.95