Finding the Fourth Proportional to 1,111.32, 1,666.68 and 938.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.32 : 1,666.68 = 938.10 : x
2. Step 2: Convert to fraction form
   1,111.32/1,666.68 = 938.10/x
3. Step 3: Cross multiply
   1,111.32x = 1,666.68 × 938.10
4. Step 4: Simplify right side
   1,111.32x = 1,563,512.51
5. Step 5: Solve for x
   x = 1,563,512.51/1,111.32
6. Step 6: Final answer
   x = 1,406.90