Finding the Fourth Proportional to 1,128.50, 1,557.34 and 663.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.50 : 1,557.34 = 663.02 : x
2. Step 2: Convert to fraction form
   1,128.50/1,557.34 = 663.02/x
3. Step 3: Cross multiply
   1,128.50x = 1,557.34 × 663.02
4. Step 4: Simplify right side
   1,128.50x = 1,032,547.57
5. Step 5: Solve for x
   x = 1,032,547.57/1,128.50
6. Step 6: Final answer
   x = 914.97