Finding the Fourth Proportional to 2,124.69, 3,189.36 and 1,688.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.69 : 3,189.36 = 1,688.74 : x
2. Step 2: Convert to fraction form
   2,124.69/3,189.36 = 1,688.74/x
3. Step 3: Cross multiply
   2,124.69x = 3,189.36 × 1,688.74
4. Step 4: Simplify right side
   2,124.69x = 5,385,999.81
5. Step 5: Solve for x
   x = 5,385,999.81/2,124.69
6. Step 6: Final answer
   x = 2,534.96