Finding the Fourth Proportional to 6,279.53, 8,643.98 and 5,428.37

Step by Step Solution

1. Step 1: Write the proportion equation
   6,279.53 : 8,643.98 = 5,428.37 : x
2. Step 2: Convert to fraction form
   6,279.53/8,643.98 = 5,428.37/x
3. Step 3: Cross multiply
   6,279.53x = 8,643.98 × 5,428.37
4. Step 4: Simplify right side
   6,279.53x = 46,922,756.89
5. Step 5: Solve for x
   x = 46,922,756.89/6,279.53
6. Step 6: Final answer
   x = 7,472.34