Finding the Fourth Proportional to 942.17, 1,404.98 and 921.25

Step by Step Solution

1. Step 1: Write the proportion equation
   942.17 : 1,404.98 = 921.25 : x
2. Step 2: Convert to fraction form
   942.17/1,404.98 = 921.25/x
3. Step 3: Cross multiply
   942.17x = 1,404.98 × 921.25
4. Step 4: Simplify right side
   942.17x = 1,294,336.62
5. Step 5: Solve for x
   x = 1,294,336.62/942.17
6. Step 6: Final answer
   x = 1,373.78