Finding the Fourth Proportional to 1,200.32, 1,656.42 and 669.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.32 : 1,656.42 = 669.21 : x
2. Step 2: Convert to fraction form
   1,200.32/1,656.42 = 669.21/x
3. Step 3: Cross multiply
   1,200.32x = 1,656.42 × 669.21
4. Step 4: Simplify right side
   1,200.32x = 1,108,492.83
5. Step 5: Solve for x
   x = 1,108,492.83/1,200.32
6. Step 6: Final answer
   x = 923.50