Finding the Fourth Proportional to 1,129.34, 1,558.32 and 663.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,129.34 : 1,558.32 = 663.50 : x
2. Step 2: Convert to fraction form
   1,129.34/1,558.32 = 663.50/x
3. Step 3: Cross multiply
   1,129.34x = 1,558.32 × 663.50
4. Step 4: Simplify right side
   1,129.34x = 1,033,945.32
5. Step 5: Solve for x
   x = 1,033,945.32/1,129.34
6. Step 6: Final answer
   x = 915.53