Finding the Fourth Proportional to 2,345.74, 3,520.34 and 1,113.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,345.74 : 3,520.34 = 1,113.15 : x
2. Step 2: Convert to fraction form
   2,345.74/3,520.34 = 1,113.15/x
3. Step 3: Cross multiply
   2,345.74x = 3,520.34 × 1,113.15
4. Step 4: Simplify right side
   2,345.74x = 3,918,666.47
5. Step 5: Solve for x
   x = 3,918,666.47/2,345.74
6. Step 6: Final answer
   x = 1,670.55