Finding the Fourth Proportional to 5,139.98, 7,710.30 and 1,807.82

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.98 : 7,710.30 = 1,807.82 : x
2. Step 2: Convert to fraction form
   5,139.98/7,710.30 = 1,807.82/x
3. Step 3: Cross multiply
   5,139.98x = 7,710.30 × 1,807.82
4. Step 4: Simplify right side
   5,139.98x = 13,938,834.55
5. Step 5: Solve for x
   x = 13,938,834.55/5,139.98
6. Step 6: Final answer
   x = 2,711.85