Finding the Fourth Proportional to 1,521.10, 2,278.82 and 869.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.10 : 2,278.82 = 869.86 : x
2. Step 2: Convert to fraction form
   1,521.10/2,278.82 = 869.86/x
3. Step 3: Cross multiply
   1,521.10x = 2,278.82 × 869.86
4. Step 4: Simplify right side
   1,521.10x = 1,982,254.37
5. Step 5: Solve for x
   x = 1,982,254.37/1,521.10
6. Step 6: Final answer
   x = 1,303.17