Finding the Fourth Proportional to 1,985.46, 2,740.82 and 1,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.46 : 2,740.82 = 1,428.72 : x
2. Step 2: Convert to fraction form
   1,985.46/2,740.82 = 1,428.72/x
3. Step 3: Cross multiply
   1,985.46x = 2,740.82 × 1,428.72
4. Step 4: Simplify right side
   1,985.46x = 3,915,857.21
5. Step 5: Solve for x
   x = 3,915,857.21/1,985.46
6. Step 6: Final answer
   x = 1,972.27