Finding the Fourth Proportional to 1,580.43, 2,181.72 and 1,126.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,580.43 : 2,181.72 = 1,126.47 : x
2. Step 2: Convert to fraction form
   1,580.43/2,181.72 = 1,126.47/x
3. Step 3: Cross multiply
   1,580.43x = 2,181.72 × 1,126.47
4. Step 4: Simplify right side
   1,580.43x = 2,457,642.13
5. Step 5: Solve for x
   x = 2,457,642.13/1,580.43
6. Step 6: Final answer
   x = 1,555.05