Finding the Fourth Proportional to 1,089.86, 1,503.58 and 670.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.86 : 1,503.58 = 670.05 : x
2. Step 2: Convert to fraction form
   1,089.86/1,503.58 = 670.05/x
3. Step 3: Cross multiply
   1,089.86x = 1,503.58 × 670.05
4. Step 4: Simplify right side
   1,089.86x = 1,007,480.06
5. Step 5: Solve for x
   x = 1,007,480.06/1,089.86
6. Step 6: Final answer
   x = 924.42