Finding the Fourth Proportional to 1,688.44, 2,331.12 and 1,294.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.44 : 2,331.12 = 1,294.72 : x
2. Step 2: Convert to fraction form
   1,688.44/2,331.12 = 1,294.72/x
3. Step 3: Cross multiply
   1,688.44x = 2,331.12 × 1,294.72
4. Step 4: Simplify right side
   1,688.44x = 3,018,147.69
5. Step 5: Solve for x
   x = 3,018,147.69/1,688.44
6. Step 6: Final answer
   x = 1,787.54