Finding the Fourth Proportional to 1,411.44, 1,930.50 and 1,388.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.44 : 1,930.50 = 1,388.76 : x
2. Step 2: Convert to fraction form
   1,411.44/1,930.50 = 1,388.76/x
3. Step 3: Cross multiply
   1,411.44x = 1,930.50 × 1,388.76
4. Step 4: Simplify right side
   1,411.44x = 2,681,001.18
5. Step 5: Solve for x
   x = 2,681,001.18/1,411.44
6. Step 6: Final answer
   x = 1,899.48