Finding the Fourth Proportional to 1,399.76, 1,931.58 and 1,265.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.76 : 1,931.58 = 1,265.30 : x
2. Step 2: Convert to fraction form
   1,399.76/1,931.58 = 1,265.30/x
3. Step 3: Cross multiply
   1,399.76x = 1,931.58 × 1,265.30
4. Step 4: Simplify right side
   1,399.76x = 2,444,028.17
5. Step 5: Solve for x
   x = 2,444,028.17/1,399.76
6. Step 6: Final answer
   x = 1,746.03