Finding the Fourth Proportional to 1,047.82, 1,571.12 and 430.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.82 : 1,571.12 = 430.83 : x
2. Step 2: Convert to fraction form
   1,047.82/1,571.12 = 430.83/x
3. Step 3: Cross multiply
   1,047.82x = 1,571.12 × 430.83
4. Step 4: Simplify right side
   1,047.82x = 676,881.88
5. Step 5: Solve for x
   x = 676,881.88/1,047.82
6. Step 6: Final answer
   x = 645.99