Finding the Fourth Proportional to 1,427.50, 2,138.89 and 1,307.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.50 : 2,138.89 = 1,307.94 : x
2. Step 2: Convert to fraction form
   1,427.50/2,138.89 = 1,307.94/x
3. Step 3: Cross multiply
   1,427.50x = 2,138.89 × 1,307.94
4. Step 4: Simplify right side
   1,427.50x = 2,797,539.79
5. Step 5: Solve for x
   x = 2,797,539.79/1,427.50
6. Step 6: Final answer
   x = 1,959.75