Finding the Fourth Proportional to 1,089.18, 1,502.73 and 623.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.18 : 1,502.73 = 623.34 : x
2. Step 2: Convert to fraction form
   1,089.18/1,502.73 = 623.34/x
3. Step 3: Cross multiply
   1,089.18x = 1,502.73 × 623.34
4. Step 4: Simplify right side
   1,089.18x = 936,711.72
5. Step 5: Solve for x
   x = 936,711.72/1,089.18
6. Step 6: Final answer
   x = 860.02