Finding the Fourth Proportional to 1,789.50, 2,679.72 and 1,056.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.50 : 2,679.72 = 1,056.72 : x
2. Step 2: Convert to fraction form
   1,789.50/2,679.72 = 1,056.72/x
3. Step 3: Cross multiply
   1,789.50x = 2,679.72 × 1,056.72
4. Step 4: Simplify right side
   1,789.50x = 2,831,713.72
5. Step 5: Solve for x
   x = 2,831,713.72/1,789.50
6. Step 6: Final answer
   x = 1,582.40