Finding the Fourth Proportional to 2,572.90, 3,861.20 and 1,113.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,572.90 : 3,861.20 = 1,113.10 : x
2. Step 2: Convert to fraction form
   2,572.90/3,861.20 = 1,113.10/x
3. Step 3: Cross multiply
   2,572.90x = 3,861.20 × 1,113.10
4. Step 4: Simplify right side
   2,572.90x = 4,297,901.72
5. Step 5: Solve for x
   x = 4,297,901.72/2,572.90
6. Step 6: Final answer
   x = 1,670.45