Finding the Fourth Proportional to 1,100.42, 1,643.09 and 938.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.42 : 1,643.09 = 938.02 : x
2. Step 2: Convert to fraction form
   1,100.42/1,643.09 = 938.02/x
3. Step 3: Cross multiply
   1,100.42x = 1,643.09 × 938.02
4. Step 4: Simplify right side
   1,100.42x = 1,541,251.28
5. Step 5: Solve for x
   x = 1,541,251.28/1,100.42
6. Step 6: Final answer
   x = 1,400.60