Finding the Fourth Proportional to 1,438.98, 2,156.77 and 1,423.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.98 : 2,156.77 = 1,423.59 : x
2. Step 2: Convert to fraction form
   1,438.98/2,156.77 = 1,423.59/x
3. Step 3: Cross multiply
   1,438.98x = 2,156.77 × 1,423.59
4. Step 4: Simplify right side
   1,438.98x = 3,070,356.20
5. Step 5: Solve for x
   x = 3,070,356.20/1,438.98
6. Step 6: Final answer
   x = 2,133.70