Finding the Fourth Proportional to 1,679.21, 2,317.59 and 1,081.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,679.21 : 2,317.59 = 1,081.53 : x
2. Step 2: Convert to fraction form
   1,679.21/2,317.59 = 1,081.53/x
3. Step 3: Cross multiply
   1,679.21x = 2,317.59 × 1,081.53
4. Step 4: Simplify right side
   1,679.21x = 2,506,543.11
5. Step 5: Solve for x
   x = 2,506,543.11/1,679.21
6. Step 6: Final answer
   x = 1,492.69