Finding the Fourth Proportional to 1,429.26, 1,973.21 and 1,115.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.26 : 1,973.21 = 1,115.25 : x
2. Step 2: Convert to fraction form
   1,429.26/1,973.21 = 1,115.25/x
3. Step 3: Cross multiply
   1,429.26x = 1,973.21 × 1,115.25
4. Step 4: Simplify right side
   1,429.26x = 2,200,616.88
5. Step 5: Solve for x
   x = 2,200,616.88/1,429.26
6. Step 6: Final answer
   x = 1,539.69