Finding the Fourth Proportional to 1,059.43, 1,577.28 and 1,054.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.43 : 1,577.28 = 1,054.30 : x
2. Step 2: Convert to fraction form
   1,059.43/1,577.28 = 1,054.30/x
3. Step 3: Cross multiply
   1,059.43x = 1,577.28 × 1,054.30
4. Step 4: Simplify right side
   1,059.43x = 1,662,921.86
5. Step 5: Solve for x
   x = 1,662,921.86/1,059.43
6. Step 6: Final answer
   x = 1,569.64