Finding the Fourth Proportional to 1,051.15, 1,575.56 and 434.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.15 : 1,575.56 = 434.69 : x
2. Step 2: Convert to fraction form
   1,051.15/1,575.56 = 434.69/x
3. Step 3: Cross multiply
   1,051.15x = 1,575.56 × 434.69
4. Step 4: Simplify right side
   1,051.15x = 684,873.39
5. Step 5: Solve for x
   x = 684,873.39/1,051.15
6. Step 6: Final answer
   x = 651.55