Finding the Fourth Proportional to 1,812.52, 2,718.72 and 991.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,812.52 : 2,718.72 = 991.18 : x
2. Step 2: Convert to fraction form
   1,812.52/2,718.72 = 991.18/x
3. Step 3: Cross multiply
   1,812.52x = 2,718.72 × 991.18
4. Step 4: Simplify right side
   1,812.52x = 2,694,740.89
5. Step 5: Solve for x
   x = 2,694,740.89/1,812.52
6. Step 6: Final answer
   x = 1,486.74