Finding the Fourth Proportional to 2,807.50, 4,209.63 and 1,247.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,807.50 : 4,209.63 = 1,247.50 : x
2. Step 2: Convert to fraction form
   2,807.50/4,209.63 = 1,247.50/x
3. Step 3: Cross multiply
   2,807.50x = 4,209.63 × 1,247.50
4. Step 4: Simplify right side
   2,807.50x = 5,251,513.43
5. Step 5: Solve for x
   x = 5,251,513.43/2,807.50
6. Step 6: Final answer
   x = 1,870.53