Finding the Fourth Proportional to 1,207.91, 1,663.54 and 1,098.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207.91 : 1,663.54 = 1,098.56 : x
2. Step 2: Convert to fraction form
   1,207.91/1,663.54 = 1,098.56/x
3. Step 3: Cross multiply
   1,207.91x = 1,663.54 × 1,098.56
4. Step 4: Simplify right side
   1,207.91x = 1,827,499.91
5. Step 5: Solve for x
   x = 1,827,499.91/1,207.91
6. Step 6: Final answer
   x = 1,512.94