Finding the Fourth Proportional to 1,462.05, 2,191.59 and 639.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,462.05 : 2,191.59 = 639.63 : x
2. Step 2: Convert to fraction form
   1,462.05/2,191.59 = 639.63/x
3. Step 3: Cross multiply
   1,462.05x = 2,191.59 × 639.63
4. Step 4: Simplify right side
   1,462.05x = 1,401,806.71
5. Step 5: Solve for x
   x = 1,401,806.71/1,462.05
6. Step 6: Final answer
   x = 958.80