Finding the Fourth Proportional to 1,194.71, 1,648.71 and 663.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,194.71 : 1,648.71 = 663.61 : x
2. Step 2: Convert to fraction form
   1,194.71/1,648.71 = 663.61/x
3. Step 3: Cross multiply
   1,194.71x = 1,648.71 × 663.61
4. Step 4: Simplify right side
   1,194.71x = 1,094,092.20
5. Step 5: Solve for x
   x = 1,094,092.20/1,194.71
6. Step 6: Final answer
   x = 915.78