Finding the Fourth Proportional to 1,931.10, 2,664.78 and 1,259.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.10 : 2,664.78 = 1,259.10 : x
2. Step 2: Convert to fraction form
   1,931.10/2,664.78 = 1,259.10/x
3. Step 3: Cross multiply
   1,931.10x = 2,664.78 × 1,259.10
4. Step 4: Simplify right side
   1,931.10x = 3,355,224.50
5. Step 5: Solve for x
   x = 3,355,224.50/1,931.10
6. Step 6: Final answer
   x = 1,737.47