Finding the Fourth Proportional to 1,521.34, 2,278.33 and 870.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.34 : 2,278.33 = 870.10 : x
2. Step 2: Convert to fraction form
   1,521.34/2,278.33 = 870.10/x
3. Step 3: Cross multiply
   1,521.34x = 2,278.33 × 870.10
4. Step 4: Simplify right side
   1,521.34x = 1,982,374.93
5. Step 5: Solve for x
   x = 1,982,374.93/1,521.34
6. Step 6: Final answer
   x = 1,303.05