Finding the Fourth Proportional to 3,245.90, 4,870.20 and 1,055.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,245.90 : 4,870.20 = 1,055.30 : x
2. Step 2: Convert to fraction form
   3,245.90/4,870.20 = 1,055.30/x
3. Step 3: Cross multiply
   3,245.90x = 4,870.20 × 1,055.30
4. Step 4: Simplify right side
   3,245.90x = 5,139,522.06
5. Step 5: Solve for x
   x = 5,139,522.06/3,245.90
6. Step 6: Final answer
   x = 1,583.39