Finding the Fourth Proportional to 1,921.07, 2,651.33 and 1,175.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.07 : 2,651.33 = 1,175.15 : x
2. Step 2: Convert to fraction form
   1,921.07/2,651.33 = 1,175.15/x
3. Step 3: Cross multiply
   1,921.07x = 2,651.33 × 1,175.15
4. Step 4: Simplify right side
   1,921.07x = 3,115,710.45
5. Step 5: Solve for x
   x = 3,115,710.45/1,921.07
6. Step 6: Final answer
   x = 1,621.86