Finding the Fourth Proportional to 5,077.76, 7,617.72 and 1,790.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,077.76 : 7,617.72 = 1,790.72 : x
2. Step 2: Convert to fraction form
   5,077.76/7,617.72 = 1,790.72/x
3. Step 3: Cross multiply
   5,077.76x = 7,617.72 × 1,790.72
4. Step 4: Simplify right side
   5,077.76x = 13,641,203.56
5. Step 5: Solve for x
   x = 13,641,203.56/5,077.76
6. Step 6: Final answer
   x = 2,686.46