Finding the Fourth Proportional to 1,051.28, 1,577.34 and 401.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.28 : 1,577.34 = 401.86 : x
2. Step 2: Convert to fraction form
   1,051.28/1,577.34 = 401.86/x
3. Step 3: Cross multiply
   1,051.28x = 1,577.34 × 401.86
4. Step 4: Simplify right side
   1,051.28x = 633,871.82
5. Step 5: Solve for x
   x = 633,871.82/1,051.28
6. Step 6: Final answer
   x = 602.95