Finding the Fourth Proportional to 7,870.79, 11,807.06 and 2,603.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.79 : 11,807.06 = 2,603.89 : x
2. Step 2: Convert to fraction form
   7,870.79/11,807.06 = 2,603.89/x
3. Step 3: Cross multiply
   7,870.79x = 11,807.06 × 2,603.89
4. Step 4: Simplify right side
   7,870.79x = 30,744,285.46
5. Step 5: Solve for x
   x = 30,744,285.46/7,870.79
6. Step 6: Final answer
   x = 3,906.12