Finding the Fourth Proportional to 2,099.98, 3,145.85 and 987.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.98 : 3,145.85 = 987.93 : x
2. Step 2: Convert to fraction form
   2,099.98/3,145.85 = 987.93/x
3. Step 3: Cross multiply
   2,099.98x = 3,145.85 × 987.93
4. Step 4: Simplify right side
   2,099.98x = 3,107,879.59
5. Step 5: Solve for x
   x = 3,107,879.59/2,099.98
6. Step 6: Final answer
   x = 1,479.96