Finding the Fourth Proportional to 7,870.50, 11,807.78 and 2,940.17

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.50 : 11,807.78 = 2,940.17 : x
2. Step 2: Convert to fraction form
   7,870.50/11,807.78 = 2,940.17/x
3. Step 3: Cross multiply
   7,870.50x = 11,807.78 × 2,940.17
4. Step 4: Simplify right side
   7,870.50x = 34,716,880.52
5. Step 5: Solve for x
   x = 34,716,880.52/7,870.50
6. Step 6: Final answer
   x = 4,411.01