Finding the Fourth Proportional to 1,663.61, 2,493.72 and 623.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.61 : 2,493.72 = 623.43 : x
2. Step 2: Convert to fraction form
   1,663.61/2,493.72 = 623.43/x
3. Step 3: Cross multiply
   1,663.61x = 2,493.72 × 623.43
4. Step 4: Simplify right side
   1,663.61x = 1,554,659.86
5. Step 5: Solve for x
   x = 1,554,659.86/1,663.61
6. Step 6: Final answer
   x = 934.51