Finding the Fourth Proportional to 1,438.59, 1,984.17 and 914.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.59 : 1,984.17 = 914.79 : x
2. Step 2: Convert to fraction form
   1,438.59/1,984.17 = 914.79/x
3. Step 3: Cross multiply
   1,438.59x = 1,984.17 × 914.79
4. Step 4: Simplify right side
   1,438.59x = 1,815,098.87
5. Step 5: Solve for x
   x = 1,815,098.87/1,438.59
6. Step 6: Final answer
   x = 1,261.72