Finding the Fourth Proportional to 1,368.80, 1,887.72 and 994.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.80 : 1,887.72 = 994.40 : x
2. Step 2: Convert to fraction form
   1,368.80/1,887.72 = 994.40/x
3. Step 3: Cross multiply
   1,368.80x = 1,887.72 × 994.40
4. Step 4: Simplify right side
   1,368.80x = 1,877,148.77
5. Step 5: Solve for x
   x = 1,877,148.77/1,368.80
6. Step 6: Final answer
   x = 1,371.38