Finding the Fourth Proportional to 1,360.74, 2,039.94 and 666.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.74 : 2,039.94 = 666.72 : x
2. Step 2: Convert to fraction form
   1,360.74/2,039.94 = 666.72/x
3. Step 3: Cross multiply
   1,360.74x = 2,039.94 × 666.72
4. Step 4: Simplify right side
   1,360.74x = 1,360,068.80
5. Step 5: Solve for x
   x = 1,360,068.80/1,360.74
6. Step 6: Final answer
   x = 999.51