Finding the Fourth Proportional to 1,054.12, 1,577.94 and 985.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.12 : 1,577.94 = 985.72 : x
2. Step 2: Convert to fraction form
   1,054.12/1,577.94 = 985.72/x
3. Step 3: Cross multiply
   1,054.12x = 1,577.94 × 985.72
4. Step 4: Simplify right side
   1,054.12x = 1,555,407.02
5. Step 5: Solve for x
   x = 1,555,407.02/1,054.12
6. Step 6: Final answer
   x = 1,475.55