Finding the Fourth Proportional to 2,098.71, 3,147.88 and 987.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,098.71 : 3,147.88 = 987.86 : x
2. Step 2: Convert to fraction form
   2,098.71/3,147.88 = 987.86/x
3. Step 3: Cross multiply
   2,098.71x = 3,147.88 × 987.86
4. Step 4: Simplify right side
   2,098.71x = 3,109,664.74
5. Step 5: Solve for x
   x = 3,109,664.74/2,098.71
6. Step 6: Final answer
   x = 1,481.70