Finding the Fourth Proportional to 1,160.83, 1,602.06 and 663.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.83 : 1,602.06 = 663.55 : x
2. Step 2: Convert to fraction form
   1,160.83/1,602.06 = 663.55/x
3. Step 3: Cross multiply
   1,160.83x = 1,602.06 × 663.55
4. Step 4: Simplify right side
   1,160.83x = 1,063,046.91
5. Step 5: Solve for x
   x = 1,063,046.91/1,160.83
6. Step 6: Final answer
   x = 915.76