Finding the Fourth Proportional to 1,200.67, 1,790.63 and 1,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.67 : 1,790.63 = 1,172.72 : x
2. Step 2: Convert to fraction form
   1,200.67/1,790.63 = 1,172.72/x
3. Step 3: Cross multiply
   1,200.67x = 1,790.63 × 1,172.72
4. Step 4: Simplify right side
   1,200.67x = 2,099,910.62
5. Step 5: Solve for x
   x = 2,099,910.62/1,200.67
6. Step 6: Final answer
   x = 1,748.95