Finding the Fourth Proportional to 1,620.72, 2,429.76 and 1,175.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.72 : 2,429.76 = 1,175.16 : x
2. Step 2: Convert to fraction form
   1,620.72/2,429.76 = 1,175.16/x
3. Step 3: Cross multiply
   1,620.72x = 2,429.76 × 1,175.16
4. Step 4: Simplify right side
   1,620.72x = 2,855,356.76
5. Step 5: Solve for x
   x = 2,855,356.76/1,620.72
6. Step 6: Final answer
   x = 1,761.78