Finding the Fourth Proportional to 1,981.61, 2,969.64 and 1,687.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,981.61 : 2,969.64 = 1,687.58 : x
2. Step 2: Convert to fraction form
   1,981.61/2,969.64 = 1,687.58/x
3. Step 3: Cross multiply
   1,981.61x = 2,969.64 × 1,687.58
4. Step 4: Simplify right side
   1,981.61x = 5,011,490.22
5. Step 5: Solve for x
   x = 5,011,490.22/1,981.61
6. Step 6: Final answer
   x = 2,529.01