Finding the Fourth Proportional to 1,059.88, 1,462.72 and 617.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.88 : 1,462.72 = 617.90 : x
2. Step 2: Convert to fraction form
   1,059.88/1,462.72 = 617.90/x
3. Step 3: Cross multiply
   1,059.88x = 1,462.72 × 617.90
4. Step 4: Simplify right side
   1,059.88x = 903,814.69
5. Step 5: Solve for x
   x = 903,814.69/1,059.88
6. Step 6: Final answer
   x = 852.75