Finding the Fourth Proportional to 1,114.68, 1,538.58 and 666.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,114.68 : 1,538.58 = 666.72 : x
2. Step 2: Convert to fraction form
   1,114.68/1,538.58 = 666.72/x
3. Step 3: Cross multiply
   1,114.68x = 1,538.58 × 666.72
4. Step 4: Simplify right side
   1,114.68x = 1,025,802.06
5. Step 5: Solve for x
   x = 1,025,802.06/1,114.68
6. Step 6: Final answer
   x = 920.27