Finding the Fourth Proportional to 1,438.14, 1,972.46 and 1,421.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.14 : 1,972.46 = 1,421.10 : x
2. Step 2: Convert to fraction form
   1,438.14/1,972.46 = 1,421.10/x
3. Step 3: Cross multiply
   1,438.14x = 1,972.46 × 1,421.10
4. Step 4: Simplify right side
   1,438.14x = 2,803,055.80
5. Step 5: Solve for x
   x = 2,803,055.80/1,438.14
6. Step 6: Final answer
   x = 1,949.08