Finding the Fourth Proportional to 2,100.60, 2,898.78 and 1,315.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.60 : 2,898.78 = 1,315.08 : x
2. Step 2: Convert to fraction form
   2,100.60/2,898.78 = 1,315.08/x
3. Step 3: Cross multiply
   2,100.60x = 2,898.78 × 1,315.08
4. Step 4: Simplify right side
   2,100.60x = 3,812,127.60
5. Step 5: Solve for x
   x = 3,812,127.60/2,100.60
6. Step 6: Final answer
   x = 1,814.78