Finding the Fourth Proportional to 1,045.86, 1,569.58 and 429.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,045.86 : 1,569.58 = 429.98 : x
2. Step 2: Convert to fraction form
   1,045.86/1,569.58 = 429.98/x
3. Step 3: Cross multiply
   1,045.86x = 1,569.58 × 429.98
4. Step 4: Simplify right side
   1,045.86x = 674,888.01
5. Step 5: Solve for x
   x = 674,888.01/1,045.86
6. Step 6: Final answer
   x = 645.29