Finding the Fourth Proportional to 1,339.58, 2,010.38 and 993.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.58 : 2,010.38 = 993.72 : x
2. Step 2: Convert to fraction form
   1,339.58/2,010.38 = 993.72/x
3. Step 3: Cross multiply
   1,339.58x = 2,010.38 × 993.72
4. Step 4: Simplify right side
   1,339.58x = 1,997,754.81
5. Step 5: Solve for x
   x = 1,997,754.81/1,339.58
6. Step 6: Final answer
   x = 1,491.33