Finding the Fourth Proportional to 1,498.51, 2,068.40 and 869.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,498.51 : 2,068.40 = 869.20 : x
2. Step 2: Convert to fraction form
   1,498.51/2,068.40 = 869.20/x
3. Step 3: Cross multiply
   1,498.51x = 2,068.40 × 869.20
4. Step 4: Simplify right side
   1,498.51x = 1,797,850.28
5. Step 5: Solve for x
   x = 1,797,850.28/1,498.51
6. Step 6: Final answer
   x = 1,199.76