Finding the Fourth Proportional to 1,872.47, 2,807.89 and 994.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,872.47 : 2,807.89 = 994.78 : x
2. Step 2: Convert to fraction form
   1,872.47/2,807.89 = 994.78/x
3. Step 3: Cross multiply
   1,872.47x = 2,807.89 × 994.78
4. Step 4: Simplify right side
   1,872.47x = 2,793,232.81
5. Step 5: Solve for x
   x = 2,793,232.81/1,872.47
6. Step 6: Final answer
   x = 1,491.74