Finding the Fourth Proportional to 2,127.72, 3,188.16 and 1,396.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,127.72 : 3,188.16 = 1,396.74 : x
2. Step 2: Convert to fraction form
   2,127.72/3,188.16 = 1,396.74/x
3. Step 3: Cross multiply
   2,127.72x = 3,188.16 × 1,396.74
4. Step 4: Simplify right side
   2,127.72x = 4,453,030.60
5. Step 5: Solve for x
   x = 4,453,030.60/2,127.72
6. Step 6: Final answer
   x = 2,092.86