Finding the Fourth Proportional to 1,384.29, 2,074.27 and 870.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.29 : 2,074.27 = 870.21 : x
2. Step 2: Convert to fraction form
   1,384.29/2,074.27 = 870.21/x
3. Step 3: Cross multiply
   1,384.29x = 2,074.27 × 870.21
4. Step 4: Simplify right side
   1,384.29x = 1,805,035.77
5. Step 5: Solve for x
   x = 1,805,035.77/1,384.29
6. Step 6: Final answer
   x = 1,303.95