Finding the Fourth Proportional to 1,981.98, 2,970.20 and 1,687.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,981.98 : 2,970.20 = 1,687.95 : x
2. Step 2: Convert to fraction form
   1,981.98/2,970.20 = 1,687.95/x
3. Step 3: Cross multiply
   1,981.98x = 2,970.20 × 1,687.95
4. Step 4: Simplify right side
   1,981.98x = 5,013,553.31
5. Step 5: Solve for x
   x = 5,013,553.31/1,981.98
6. Step 6: Final answer
   x = 2,529.57