Finding the Fourth Proportional to 1,355.98, 1,870.70 and 1,002.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.98 : 1,870.70 = 1,002.72 : x
2. Step 2: Convert to fraction form
   1,355.98/1,870.70 = 1,002.72/x
3. Step 3: Cross multiply
   1,355.98x = 1,870.70 × 1,002.72
4. Step 4: Simplify right side
   1,355.98x = 1,875,783.29
5. Step 5: Solve for x
   x = 1,875,783.29/1,355.98
6. Step 6: Final answer
   x = 1,383.35