Finding the Fourth Proportional to 1,109.61, 1,664.78 and 623.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.61 : 1,664.78 = 623.03 : x
2. Step 2: Convert to fraction form
   1,109.61/1,664.78 = 623.03/x
3. Step 3: Cross multiply
   1,109.61x = 1,664.78 × 623.03
4. Step 4: Simplify right side
   1,109.61x = 1,037,196.44
5. Step 5: Solve for x
   x = 1,037,196.44/1,109.61
6. Step 6: Final answer
   x = 934.74