Finding the Fourth Proportional to 1,977.79, 2,961.42 and 1,728.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,977.79 : 2,961.42 = 1,728.72 : x
2. Step 2: Convert to fraction form
   1,977.79/2,961.42 = 1,728.72/x
3. Step 3: Cross multiply
   1,977.79x = 2,961.42 × 1,728.72
4. Step 4: Simplify right side
   1,977.79x = 5,119,465.98
5. Step 5: Solve for x
   x = 5,119,465.98/1,977.79
6. Step 6: Final answer
   x = 2,588.48