Finding the Fourth Proportional to 1,634.72, 2,438.27 and 1,388.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,634.72 : 2,438.27 = 1,388.48 : x
2. Step 2: Convert to fraction form
   1,634.72/2,438.27 = 1,388.48/x
3. Step 3: Cross multiply
   1,634.72x = 2,438.27 × 1,388.48
4. Step 4: Simplify right side
   1,634.72x = 3,385,475.20
5. Step 5: Solve for x
   x = 3,385,475.20/1,634.72
6. Step 6: Final answer
   x = 2,070.99