Finding the Fourth Proportional to 12,990.83, 19,486.25 and 3,130.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.83 : 19,486.25 = 3,130.10 : x
2. Step 2: Convert to fraction form
   12,990.83/19,486.25 = 3,130.10/x
3. Step 3: Cross multiply
   12,990.83x = 19,486.25 × 3,130.10
4. Step 4: Simplify right side
   12,990.83x = 60,993,798.04
5. Step 5: Solve for x
   x = 60,993,798.04/12,990.83
6. Step 6: Final answer
   x = 4,695.14