Finding the Fourth Proportional to 1,615.82, 2,230.56 and 1,056.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.82 : 2,230.56 = 1,056.31 : x
2. Step 2: Convert to fraction form
   1,615.82/2,230.56 = 1,056.31/x
3. Step 3: Cross multiply
   1,615.82x = 2,230.56 × 1,056.31
4. Step 4: Simplify right side
   1,615.82x = 2,356,157.26
5. Step 5: Solve for x
   x = 2,356,157.26/1,615.82
6. Step 6: Final answer
   x = 1,458.19