Finding the Fourth Proportional to 1,074.72, 1,620.38 and 1,068.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,074.72 : 1,620.38 = 1,068.06 : x
2. Step 2: Convert to fraction form
   1,074.72/1,620.38 = 1,068.06/x
3. Step 3: Cross multiply
   1,074.72x = 1,620.38 × 1,068.06
4. Step 4: Simplify right side
   1,074.72x = 1,730,657.72
5. Step 5: Solve for x
   x = 1,730,657.72/1,074.72
6. Step 6: Final answer
   x = 1,610.33