Finding the Fourth Proportional to 1,438.78, 1,983.23 and 1,088.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.78 : 1,983.23 = 1,088.86 : x
2. Step 2: Convert to fraction form
   1,438.78/1,983.23 = 1,088.86/x
3. Step 3: Cross multiply
   1,438.78x = 1,983.23 × 1,088.86
4. Step 4: Simplify right side
   1,438.78x = 2,159,459.82
5. Step 5: Solve for x
   x = 2,159,459.82/1,438.78
6. Step 6: Final answer
   x = 1,500.90