Finding the Fourth Proportional to 2,077.21, 3,113.76 and 1,153.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,077.21 : 3,113.76 = 1,153.21 : x
2. Step 2: Convert to fraction form
   2,077.21/3,113.76 = 1,153.21/x
3. Step 3: Cross multiply
   2,077.21x = 3,113.76 × 1,153.21
4. Step 4: Simplify right side
   2,077.21x = 3,590,819.17
5. Step 5: Solve for x
   x = 3,590,819.17/2,077.21
6. Step 6: Final answer
   x = 1,728.67