Finding the Fourth Proportional to 1,238.61, 1,709.57 and 845.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.61 : 1,709.57 = 845.59 : x
2. Step 2: Convert to fraction form
   1,238.61/1,709.57 = 845.59/x
3. Step 3: Cross multiply
   1,238.61x = 1,709.57 × 845.59
4. Step 4: Simplify right side
   1,238.61x = 1,445,595.30
5. Step 5: Solve for x
   x = 1,445,595.30/1,238.61
6. Step 6: Final answer
   x = 1,167.11