Finding the Fourth Proportional to 2,099.90, 3,147.15 and 1,867.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.90 : 3,147.15 = 1,867.70 : x
2. Step 2: Convert to fraction form
   2,099.90/3,147.15 = 1,867.70/x
3. Step 3: Cross multiply
   2,099.90x = 3,147.15 × 1,867.70
4. Step 4: Simplify right side
   2,099.90x = 5,877,932.06
5. Step 5: Solve for x
   x = 5,877,932.06/2,099.90
6. Step 6: Final answer
   x = 2,799.15