Finding the Fourth Proportional to 2,345.90, 3,518.89 and 1,312.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,345.90 : 3,518.89 = 1,312.49 : x
2. Step 2: Convert to fraction form
   2,345.90/3,518.89 = 1,312.49/x
3. Step 3: Cross multiply
   2,345.90x = 3,518.89 × 1,312.49
4. Step 4: Simplify right side
   2,345.90x = 4,618,513.45
5. Step 5: Solve for x
   x = 4,618,513.45/2,345.90
6. Step 6: Final answer
   x = 1,968.76