Finding the Fourth Proportional to 1,401.28, 1,938.32 and 1,306.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.28 : 1,938.32 = 1,306.72 : x
2. Step 2: Convert to fraction form
   1,401.28/1,938.32 = 1,306.72/x
3. Step 3: Cross multiply
   1,401.28x = 1,938.32 × 1,306.72
4. Step 4: Simplify right side
   1,401.28x = 2,532,841.51
5. Step 5: Solve for x
   x = 2,532,841.51/1,401.28
6. Step 6: Final answer
   x = 1,807.52