Finding the Fourth Proportional to 1,355.84, 1,872.81 and 1,002.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.84 : 1,872.81 = 1,002.47 : x
2. Step 2: Convert to fraction form
   1,355.84/1,872.81 = 1,002.47/x
3. Step 3: Cross multiply
   1,355.84x = 1,872.81 × 1,002.47
4. Step 4: Simplify right side
   1,355.84x = 1,877,440.52
5. Step 5: Solve for x
   x = 1,877,440.52/1,355.84
6. Step 6: Final answer
   x = 1,384.71