Finding the Fourth Proportional to 1,631.52, 2,248.56 and 1,188.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,631.52 : 2,248.56 = 1,188.72 : x
2. Step 2: Convert to fraction form
   1,631.52/2,248.56 = 1,188.72/x
3. Step 3: Cross multiply
   1,631.52x = 2,248.56 × 1,188.72
4. Step 4: Simplify right side
   1,631.52x = 2,672,908.24
5. Step 5: Solve for x
   x = 2,672,908.24/1,631.52
6. Step 6: Final answer
   x = 1,638.29