Finding the Fourth Proportional to 1,914.72, 2,870.79 and 664.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,914.72 : 2,870.79 = 664.99 : x
2. Step 2: Convert to fraction form
   1,914.72/2,870.79 = 664.99/x
3. Step 3: Cross multiply
   1,914.72x = 2,870.79 × 664.99
4. Step 4: Simplify right side
   1,914.72x = 1,909,056.86
5. Step 5: Solve for x
   x = 1,909,056.86/1,914.72
6. Step 6: Final answer
   x = 997.04