Finding the Fourth Proportional to 1,031.58, 1,423.59 and 617.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.58 : 1,423.59 = 617.50 : x
2. Step 2: Convert to fraction form
   1,031.58/1,423.59 = 617.50/x
3. Step 3: Cross multiply
   1,031.58x = 1,423.59 × 617.50
4. Step 4: Simplify right side
   1,031.58x = 879,066.83
5. Step 5: Solve for x
   x = 879,066.83/1,031.58
6. Step 6: Final answer
   x = 852.16