Finding the Fourth Proportional to 1,724.81, 2,587.86 and 993.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.81 : 2,587.86 = 993.98 : x
2. Step 2: Convert to fraction form
   1,724.81/2,587.86 = 993.98/x
3. Step 3: Cross multiply
   1,724.81x = 2,587.86 × 993.98
4. Step 4: Simplify right side
   1,724.81x = 2,572,287.55
5. Step 5: Solve for x
   x = 2,572,287.55/1,724.81
6. Step 6: Final answer
   x = 1,491.35