Finding the Fourth Proportional to 1,051.42, 1,577.18 and 434.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.42 : 1,577.18 = 434.72 : x
2. Step 2: Convert to fraction form
   1,051.42/1,577.18 = 434.72/x
3. Step 3: Cross multiply
   1,051.42x = 1,577.18 × 434.72
4. Step 4: Simplify right side
   1,051.42x = 685,631.69
5. Step 5: Solve for x
   x = 685,631.69/1,051.42
6. Step 6: Final answer
   x = 652.10