Finding the Fourth Proportional to 1,045.72, 1,569.83 and 429.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,045.72 : 1,569.83 = 429.93 : x
2. Step 2: Convert to fraction form
   1,045.72/1,569.83 = 429.93/x
3. Step 3: Cross multiply
   1,045.72x = 1,569.83 × 429.93
4. Step 4: Simplify right side
   1,045.72x = 674,917.01
5. Step 5: Solve for x
   x = 674,917.01/1,045.72
6. Step 6: Final answer
   x = 645.41