Finding the Fourth Proportional to 1,491.28, 2,060.52 and 1,438.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.28 : 2,060.52 = 1,438.72 : x
2. Step 2: Convert to fraction form
   1,491.28/2,060.52 = 1,438.72/x
3. Step 3: Cross multiply
   1,491.28x = 2,060.52 × 1,438.72
4. Step 4: Simplify right side
   1,491.28x = 2,964,511.33
5. Step 5: Solve for x
   x = 2,964,511.33/1,491.28
6. Step 6: Final answer
   x = 1,987.90