Finding the Fourth Proportional to 2,100.18, 2,895.21 and 1,390.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.18 : 2,895.21 = 1,390.84 : x
2. Step 2: Convert to fraction form
   2,100.18/2,895.21 = 1,390.84/x
3. Step 3: Cross multiply
   2,100.18x = 2,895.21 × 1,390.84
4. Step 4: Simplify right side
   2,100.18x = 4,026,773.88
5. Step 5: Solve for x
   x = 4,026,773.88/2,100.18
6. Step 6: Final answer
   x = 1,917.35