Finding the Fourth Proportional to 1,438.50, 1,986.76 and 971.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.50 : 1,986.76 = 971.94 : x
2. Step 2: Convert to fraction form
   1,438.50/1,986.76 = 971.94/x
3. Step 3: Cross multiply
   1,438.50x = 1,986.76 × 971.94
4. Step 4: Simplify right side
   1,438.50x = 1,931,011.51
5. Step 5: Solve for x
   x = 1,931,011.51/1,438.50
6. Step 6: Final answer
   x = 1,342.38