Finding the Fourth Proportional to 5,088.25, 7,632.78 and 1,390.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,088.25 : 7,632.78 = 1,390.78 : x
2. Step 2: Convert to fraction form
   5,088.25/7,632.78 = 1,390.78/x
3. Step 3: Cross multiply
   5,088.25x = 7,632.78 × 1,390.78
4. Step 4: Simplify right side
   5,088.25x = 10,615,517.77
5. Step 5: Solve for x
   x = 10,615,517.77/5,088.25
6. Step 6: Final answer
   x = 2,086.28